I dont understand how they got D

On April 30, 2013, McKensie Products purchased machinery for $66,000. The useful life of this machinery is estimated at 5 years, with a $16,000 residual value. The company uses the doubledeclining-balance method. Depreciation expense for the fiscal year ending on December 31, 2014 will be: A) $15,840 B) $18,400 C) $21,067 D) $19,360