Compatibility Services acquired an $80,000 machine on January 1, 20X3. The machine is estimated to have a useful life of 8 years, and a residual value of $4,000. For units-of-production depreciation purposes, the machine is expected to produce 400,000 units. If Compatibility Services uses double-declining-balance depreciation, what is the net book value of the machine on December 31, 20X5?

Select one: A. $ 33,750 B. $ -0- C. $46,250 D. $ 30,000 E. $40,000