Depreciation for Partial Periods truck was driven $8,000$ miles in $2019$ and $16,000$ miles in $2020.$ Bar computes depreciation expense to the nearest whole month.

Required:

Compute depreciation expense for $2019$ and $2020$ using the following methods: $($Round your answers to the nearest dollar.$)$

a$.$ Straight$-$line method

$2019$$

$2020$$

b$.$ Sum$-$of$-$the$-$years'$-$digits method

$2019$$

$2020$$

c$.$ Double$-$declining$-$balance method

$2019$$

$2020$$

d$.$ Activity method

$2019$$

$2020$$

$2.$ For each method, what is the book value of the machine at the end of $2019?$ At the end of $2020($Round your answers to the nearest dollar.$)$

a$.$ Straight$-$line method

$2019$$