- 48 - The movements of employee benefit obligations for the years ended December 31, are as follows: Unit : Million Baht Consolidated financial statements Separate financial statements 2021 2020 2021 2020 Opening book amount 4,239 4,836 4,188 4,788 Current service costs 202 227 198 224 Interest cost 62 85 61 84 Past service cost - (607) - (608) (Gain) loss on remeasurement of retirement benefit obligations (407) 139 (402) 140 (Gain) loss on remeasurement of other long-term benefit obligations (4) 47 (3) 47 Benefits paid (87) (488) (84) (487) Closing book amount 4,005 4,239 3,958 4,188 The expenses of Baht 175 million and Baht 173 million (2020 : Baht 193 million and Baht 191 million) were included in cost of sales in the consolidated and separate statements of profit or loss, respectively. The expenses (reversal) of Baht 85 million and Baht 83 million (2020 : Baht (441) million and Baht (444) million) were included in administrative expenses in the consolidated and separate statements of profit or loss, respectively. The principle actuarial assumptions used for calculating the employee benefit obligations as at December 31, are as follows: Unit : Percentage Consolidated financial statements Separate financial statements 2021 2020 2021 2020 Discount rate 2.3 1.5 2.3 1.5 Salary growth rate 4.0 - 8.0 4.0 - 8.0 5.0 - 8.0 5.0 - 8.0 Turnover rate 0 - 7.0 0 - 7.0 0 - 2.0 0 - 2.0 The sensitivity analysis of the above actuarial assumptions impacted on increase (decrease) in present value of the employee benefit obligations as at December 31, are as follows: Unit : Million Baht Consolidated financial statements 2021 2020 Impact on defined benefit obligation Impact on defined benefit obligation Change in assumption Increase in assumption Decrease in assumption Increase in assumption Decrease in assumption Discount rate 1% (390) 451 (447) 522 Salary growth rate 1% 354 (312) 407 (356) 350 IRPC PUBLIC COMPANY LIMITED 56-1 ONE REPORT 2021
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