A machine with a cost of $61,664 has an estimated residual value of $5,525 and an estimated life of 7 years or 17,073 hours. It is to be depreciated by the units-of-activity method. What is the amount of depreciation for the second full year, during which the machine was used 3,611 hours? Do not round your intermediate calculations. Oa. $13,042.15 Ob. $16,039.71 Oc. $11,873.60 C. Od. $8,019.86