Answer is D. Any help in how to get that answer would be awesome!

Shaggy Limited purchased a new van on January 1,2011. The van cost $20,000. It has an estimated life of five years and the estimated residual value is S5,000. Shaggy uses the double-declining-balance method to compute depreciation. What is the adjusted balance in the Accumulated Depreciation account at the end of 2012? A) S3,200 B) S4,800 C) S9,600. D) S12,800. 9