1. Vickers Company use the units-of-production method in computing depreciation expense. A new plant asset is purchased for $18,000 that will produce an estimated 100,000 units over its useful life. Estimated residual value at the end of its useful life is $2,000. What is the depreciation cost perunit ? 2.Equipment with a cost of $160,000 has an estimated residual value of $10,000 and an estimated life of 4 years or 12,000 hours. It is to be depreciated by the straight-line method. What is the amount of depreciation expense for the first full year, during which the equipment was used 3,300 hours