On January 2, 2012 McNally's Extra Corporation Acquired Equipment for $120,000

On January 2, 2012 McNally's Extra Corporation acquired equipment for $120,000. The estimated life of the equipment is 5 years or 20,000 hours. The estimated residual value is $20,000. What is the amount of depreciation expense for 2014, if McNally's Extra Corporation uses the asset 4,000 hours and uses the units-of-production method of depreciation?

A) $20,000
B) $24,000
C) $25,000
D) $30,000