A machine costing $251,800 was purchased May 1. The machine should be obsolete after three years and, therefore, no longer useful to the company. The estimated salvage value is $3,400. Calculate the depreciation expense for each year of its expected useful life using each of the following depreciation methods: (a) straight-line, (b) double-declining balance. For double-declining balance, do not round until your final answer. Round your final answers to the nearest dollar.

a. Straight-line:

Year 1:?

Year 2:82400

Year 3:82400

Year 4:?

b. Double-declining balance:

Year 1:?

Year 2:?

Year 3:?

Year 4:?

Please just help me figure out answers 1 and 4 for part a, and all years for part b. I know that the value for year 4 is not 0 for part a and part b.