Cullumber Company purchased a delivery truck for $$38,000$ on January $1,2027.$ The truck has an expected salvage value of $$7,000,$ and is expected to be driven $100,000$ miles over its estimated useful life of $8$ years. Actual miles driven were $15,900$ in $2027$ and $14,900$ in $2028.($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