A machine with a cost of $75,000 has an estimated residual value of $5,000 and an estimated life of 4 years or 18,000 hours. What is the amount of depreciation for the second full year, using the double-declining-balance method? a. $17, 500 b.$37, 500 c. $18, 750 d. $16, 667 Equipment with a cost of $160,000, an estimated residual value of $40,000, and an estimated life of 15 years was depreciated by the straight-line method for 4 years. Due to obsolescence, it was determined that the remaining useful life should be shortened by 3 years and the residual value changed to zero. The depreciation expense for the current and future years is a. $11, 636 b. $16,000 c. $11,000 d. $8,000