Certain debtors with settlement problems are included in the above trade accounts receivable. The Group has set up provisions to account for these debtors. The outstanding balances can be aged as follows: Consolidated Company 31 March 31 December 31 March 31 December 2000 1999 2000 1999 Million Baht Million Baht Million Baht Million Baht Overdue 3 - 6 months 204 239 185 218 Overdue 6 - 12 months 201 191 176 190 Over 12 months 38 36 38 25 443 466 399 433 Allowance for doubtful accounts (280) (280) (223) (233) The directors are of the opinion that allowance for doubtful debts overdue more than 3 months of the Group in conjunction with deposits received from these customers (presented in balance sheet as deposits from customers) and bank guarantees received from dealers are sufficient to cover the bad debt risk. 5 Long-term investments, net Consolidated Company 31 March 31 December 31 March 31 December 2000 1999 2000 1999 Million Baht Million Baht Million Baht Million Baht Subsidiaries - - 4,199 3,826 Marketable debt security - available for sale 60 - - - Other company, net - - - - Total long-term investments, net 60 - 4,199 3,826 Investments in subsidiaries Company 31 March 2000 Million Baht Opening balance Cost 2,732 Accumulated share of net profit (loss) in subsidiaries 1,094 Opening net book amount 3,826 Share of net profit in subsidiaries 373 Closing net book amount 4,199 5 Long-term investments, net (continued) Company - 31 March 2000 Country of Nature of Paid-up capital Nature of business incorporation relationship (Million Baht) Subsidiaries Advanced Paging Service provider of Thailand Shareholder 350 Co., Ltd. digital paging system network, trading of pagers and providing pagers for rent Advanced Wireless Importer and distributor Thailand Shareholder 240 Marketing Co., Ltd. of cellular phones, related accessories and cellular phone rental service provider Advanced Service provider Thailand Shareholder 458 Datanetwork of voice/data Communications communications via Co., Ltd. telephone line (formerly "Shinawatra Datacom Co., Ltd.") Datanetwork Solutions Service provider of Thailand Shareholder 1 Co., Ltd. voice/data communications via telephone line Company - 31 March 2000 Accumulated share of profit (loss) in Investment Cost subsidiaries Equity Dividend portion (%) (Million Baht) (Million Baht) (Million Baht) (Million Baht) Subsidiaries Advanced Paging 99.99 1,703 250 1,953 - Co., Ltd. Advanced Wireless 99.99 600 1,240 1,840 - Marketing Co., Ltd. Advanced 67.95 421 (25) 396 - Datanetwork Communications Co., Ltd. (formerly "Shinawatra Datacom Co., Ltd.") Datanetwork Solutions 49.00 8 2 10 - Co., Ltd. 2,732 1,467 4,199 - 5 Long-term investments, net (continued) Company - 31 December 1999 Country of Nature of Paid-up capital Nature of business incorporation relationship (Million Baht) Subsidiaries Advanced Paging Service provider of Thailand Shareholder 350 Co., Ltd. digital paging system network, trading of pagers and providing pagers for rent Advanced Wireless Importer and distributor Thailand Shareholder 240 Marketing Co., Ltd. of cellular phones, related accessories and cellular phone rental service provider Advanced Service provider Thailand Shareholder 458 Datanetwork of voice/data Communications communications via Co., Ltd. telephone line (formerly "Shinawatra Datacom Co., Ltd.") Datanetwork Solutions Service provider of Thailand Shareholder 1 Co., Ltd. voice/data communications via telephone line Company - 31 December 1999 Accumulated share of profit (loss) in Investment Cost subsidiaries Equity Dividend portion (%) (Million Baht) (Million Baht) (Million Baht) (Million Baht) Subsidiaries Advanced Paging 99.99 1,703 228 1,931 - Co., Ltd. Advanced Wireless 99.99 600 885 1,485 - Marketing Co., Ltd. Advanced 67.95 421 (18) 403 - Datanetwork Communications Co., Ltd. (formerly "Shinawatra Datacom Co., Ltd.") Datanetwork Solutions 49.00 8 (1) 7 - Co., Ltd. 2,732 1,094 3,826 - 5 Long-term investments, net (continued) Investment in marketable debt security - available for sale Consolidated 31 March 31 December 2000 1999 Million Baht Million Baht Opening net book amount - - Addition 60 - Disposal - - Closing net book amount 60 - The investment in marketable debt security represents investment in 60,000 units of Baht 1,000 each of unsubordinated and unsecured debentures of The Siam Cement Public Company Limited. Such debentures are due in 2006 and bear interest at the fixed rate of 7.75% per annum for the first 4 years and average floating 12 month fixed deposit rate plus 2% for the remaining years. Interest is payable on a quarterly basis. Investment in other company Percentage of holding by the Group and the Company 31 March 31 December 2000 1999 Nature of business Percent Percent Unlisted company Fonepoint (Thailand) Co., Ltd. Service provider of cellular phones 17.80 17.80 Consolidated Company 31 March 31 December 31 March 31 December 2000 1999 2000 1999 Million Baht Million Baht Million Baht Million Baht Other company: Unlisted company Investment, at cost 17 17 17 17 Less: Provision for change in fair value of investment (17) (17) (17) (17) Total investment in other company, net - - - - 6 Property and equipment, net Consolidated - Million Baht Leasehold Buildings and Leasehold building Tools and Land improvements rights improvements equipment At 31 December 1999 Cost 8 57 44 120 2,613 Less: Accumulated depreciation - (25) (35) (42) (1,142) Provision for obsolete fixed Assets - - - - - Net book amount 8 32 9 78 1,471 For the three-month period ended 31 March 2000 Opening net book amount 8 32 9 78 1,471 Additions - - 4 8 188 Transfers - - - 3 24 Write-offs, net - - - - (169) Depreciation charge - - (1) (4) (127) Closing net book amount 8 32 12 85 1,387 At 31 March 2000 Cost 8 57 48 131 2,589 Less: Accumulated depreciation - (25) (36) (46) (1,202) Provision for obsolete fixed Assets - - - - - Net book amount 8 32 12 85 1,387 Consolidated - Million Baht Furniture, Pagers and Assets under Assets fixtures mobile construction purchased Total and office phones for and under finance property and equipment rent Vehicles installation leases equipment At 31 December 1999 Cost 781 88 64 30 4 3,809 Less: Accumulated depreciation (491) (57) (27) - (3) (1,822) Provision for obsolete fixed Assets (10) (2) - - - (12) Net book amount 280 29 37 30 1 1,975 For the three-month period ended 31 March 2000 Opening net book amount 280 29 37 30 1 1,975 Additions 37 6 4 65 - 312 Transfers 1 - - (66) - (38) Write-offs, net - - - - - (169) Depreciation charge (26) (5) (4) - - (167) Closing net book amount 292 30 37 29 1 1,913 At 31 March 2000 Cost 819 94 68 29 4 3,847 Less: Accumulated depreciation (517) (62) (31) - (3) (1,922) Provision for obsolete fixed Assets (10) (2) - - - (12) Net book amount 292 30 37 29 1 1,913 6 Property and equipment, net (continued) Company - Million Baht Furniture, Assets under Assets Leasehold fixtures construction purchased Buildings and building Tools and and office and under finance Total property improvements improvements equipment equipment Vehicles installation leases and equipment At 31 December 1999 Cost 16 112 2,526 457 48 25 4 3,188 Less: Accumulated depreciation (4) (35) (1,095) (252) (20) - (3) (1,409) Net book amount 12 77 1,431 205 28 25 1 1,779 For the three-month period ended 31 March 2000 Opening net book amount 12 77 1,431 205 28 25 1 1,779 Additions - 2 183 13 3 43 - 244 Transfers - 3 24 1 - (66) - (38) Write-offs, net - - (169) - - - - (169) Depreciation charge - (4) (126) (17) (2) - - (149) Closing net book amount 12 78 1,343 202 29 2 1 1,667 At 31 March 2000 Cost 16 117 2,495 471 51 2 4 3,156 Less: Accumulated depreciation (4) (39) (1,152) (269) (22) - (3) (1,489) Net book amount 12 78 1,343 202 29 2 1 1,667 7 Cost of mobile phone and pager service networks and Datanet tools and equipment under concession agreements Consolidated - Million Baht Total cost of mobile phone and pager service networks Cost of Cost of pager Cost of Datanet and Datanet mobile phone service tools and tools and networks networks equipment equipment At 31 December 1999 Cost 37,596 1,275 787 39,658 Less: Accumulated amortisation (11,876) (547) (423) (12,846) Net book amount 25,720 728 364 26,812 For the three-month period ended 31 March 2000 Opening net book amount 25,720 728 364 26,812 Additions 2,850 4 24 2,878 Transfers 38 - - 38 Amortisation charge (963) (33) (14) (1,010) Closing net book amount 27,645 699 374 28,718 At 31 March 2000 Cost 40,484 1,279 811 42,574 Less: Accumulated amortisation (12,839) (580) (437) (13,856) Net book amount 27,645 699 374 28,718 7 Cost of mobile phone and pager service networks and Datanet tools and equipment under concession agreements (continued) Company Million Baht Cost of mobile phone networks At 31 December 1999 Cost 37,596 Less: Accumulated amortisation (11,876) Net book amount 25,720 For the three-month period ended 31 March 2000 Opening net book amount 25,720 Additions 2,850 Transfers 38 Amortisation charge (963) Closing net book amount 27,645 At 31 March 2000 Cost 40,484 Less: Accumulated amortisation (12,839) Net book amount 27,645 8 Other assets Consolidated - Million Baht Deferred Goodwill charges Others Total At 31 December 1999 Cost 1,164 757 160 2,081 Less: Accumulated amortisation (352) (222) - (574) Net book amount 812 535 160 1,507 For the three-month period ended 31 March 2000 Opening net book amount 812 535 160 1,507 Additions - 9 6 15 Write-offs, net - (96) (2) (98) Amortisation charge (29) (46) - (75) Closing net book amount 783 402 164 1,349 At 31 March 2000 Cost 1,164 657 164 1,985 Less: Accumulated amortisation (381) (255) - (636) Net book amount 783 402 164 1,349 Company - Million Baht Deferred charges Others Total At 31 December 1999 Cost 568 106 674 Less: Accumulated amortisation (199) - (199) Net book amount 369 106 475 For the three-month period ended 31 March 2000 Opening net book amount 369 106 475 Additions 9 - 9 Write-offs, net (96) (2) (98) Amortisation charge (25) - (25) Closing net book amount 257 104 361 At 31 March 2000 Cost 468 104 572 Less: Accumulated amortisation (211) - (211) Net book amount 257 104 361 9 Long-term debentures (more)