Ryan is self$-$employed. This year Ryan used his personal auto for several long business trips. Ryan paid $$2,080$ for gasoline on these trips. His depreciation on the car if he was using it fully for business purposes would be $$4,800.$ During the year, he drove his car a total of $15,400$ miles $($a combination of business and personal travel.

a$.$ Ryan can provide written documentation of the business purpose for trips totaling $3,080$ miles. What business expense amount can Ryan deduct $($if any$)$ for these trips

b$.$ Ryan estimates that he drove approximately $1,740$ miles on business trips, but he can only provide written documentation of the business purpose for trip$***$This question already posted and got correct answer. Don't answer this question If you answer i will give $10$ dislikes.$****$s totaling $840$ miles. What