Ayayai Corporation purchased a new machine for its assembly process on August 1, 2017. The cost of this machine was $143,838. The company estimated that the machine would have a salvage value of $15,738 at the end of its service life. Its life is estimated at 5 years, and its working hours are estimated at 20,100 hours. Year-end is December 31.

Compute the deprecation expese under the following method: Double declining balance for 2018.

I did

2017: Cost-AD*0.40 *8/12= 38,357

2018: 143,838-38,357 *0.40= 42,192.

But the anwer was wrong. Could you help me, please?