Lightning Delivery Company purchased a new delivery truck for $$45,000$ on April $1,2019.$ The truck is expected to have a service life of $10$ years or $120,000$ miles and a residual value of $$3,000.$ The truck was driven $10,000$ miles in $2019$ and $13,000$ miles in $2020.$ Lightning cornputes 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

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