On January $1,2020,$ Alaska Freight Transportation Company purchased a used aircraft at a cost of $$48,400,000.$ Alaska Freight expects the plane to remain useful for five years miles$)$ and to have a residual value of $$4,400,000.$ Alaska Freight expects to fly the plane $900,000$ miles the first year, $1,300,000$ miles each year during the second, third, and fourth years, and $1,200,000$ miles the last year.

Compute Alaska Freight's depreciation for the first two years on the plane using the straight$-$line method, the units$-$of$-$production method, and the double$-$declining balance method.

a$.$ Straight$-$line method

Using the straight$-$line method, depreciation is for $2020$ and $$ for $2021.$