Cullumber Company purchased a delivery truck for $$24,000$ on January $1,2022.$ The truck has an expected salvage value of $$1,000,$ and is expected to be driven $100,000$ miles over its estimated useful life of $8$ years. Actual miles driven were $12,000$ in $2022$ and $10,000$ in $2023.$

$($a$1)$

Calculate depreciable cost per mile under units$-$of$-$activity method. $($Round answer to $2$ decimal places, e$.$g$.0\mathrm{.}50.)$

Depreciable cost $$,$ per mile