Equipment with a cost of $88,541, an estimated residual value of $4,101, and an estimated life of 13 years was depreciated by the straightline method for 5 years. Due to obsolescence, it was determined that the remaining useful life should be shortened by 4 years and the residual value changed to zero. The depreciation expense for the current and future years is a. $4,312.62 b. 56,229.34 c. $14,01602 d. 532,476,92