Read the requirements.

a$.$ Straight$-$line method

$2020$

$2021$

Straight$-$line method depreciation

b$.$ Units$-$of$-$production method $($Round the depreciation per unit of output to two decimal places to compute your final answers.$)$

c$.$ Double$-$declining balance method

$2020$

$2021$

Double$-$declining$-$balance method depreciation

$2.$ Show the airplane's book value at the end of the first year under each method.