Depreclation by two methods

A storage tank acquired at the beginning of the fiscal year at a cost of $$79,200$ has an estimated residual value of $$4,000$ and an estimated useful life of $20$ years.

a$.$ Determine the amount of annual depreciation by the straight$-$line method.

b$.$ Determine the amount of depreciation for the first and second years computed by the double$-$declining$-$balance method. Do not round the double$-$declining balance rate. If required, round your answers to the nearest dollar.