a machine with a cost of 165,000 has an estimated residual value

A machine with a cost of $165,000 has an estimated residual value of $15,000 and an estimated life of 5 years or 15,000 hours. It is to be units-of-activity method. What is the amount of depreciation for the second full year, during which the machine was used 6,000 Oa. $72,000 Ob. $60,000 Oc, $6,000 Od$45,000 depreciated by the