Equipment with a cost of $154,120 has an estimated residual value of $8,431 and an estimated life of 6 years or 14,901 hours. It is to be depreciated by the straight-line method. What is the amount of depreciation for the first full year, during which the equipment was used 3,139 hours?

a.$30,690.41

b.$24,281.50

c.$6.00

d.$46.41