On January 1,2013,Zane Manufacturing Company Purchased a Machine for $40,000

On January 1,2013,Zane Manufacturing Company purchased a machine for $40,000.The company expects to use the machine a total of 24,000 hours over the next 6 years.The estimated sales price of the machine at the end of 6 years is $4,000.The company used the machine 8,000 hours in 2013 and 12,000 in 2014.
-What is the book value of the machine at the end of 2014 if the company uses double-declining-balance depreciation?

A) $20,000
B) $17,778
C) $13,333
D) $28,000