ABC purchased an equipment 3 years ago at a cost of P100,000. Residual value is P10,000 and useful life is 5 years. ABC used the straight line method of depreciation. On Jan 1, 20X4, at the start of the fourth year, the business added a part worth P50,000 that will prolong its remaining useful life to 4 years. How much is the depreciation expense for the

24,000

21,500

18,000

12,500