d. $21,667 i 4. Equipment purchased May 1, 200X for $90,000 has an estimated residual value of $6,000 and an estimated life of 4 years. What is the amount of depreciation for the second full year, using the declining-balance method at double the straight-line rate? a. $30,000 uil b.$28,000 c. $22,500 in d. $21,000 . co 5. Equipment with a cost of $80,000, an estimated residual value of $5,000, and an estimated life of 15 years was depreciated by the straight-line method for 5 years. Due to obsolescence, it was determined that the useful life should be shortened by 5 years and the residual value changed to zero. The depreciation expense for the current and future years is: . co a. $5,500 b. $11,000 c. $10,000 d. $5,000