Ryan is self$-$employed. This year Ryan used his personal auto for several long business trips. Ryan paid $$1,920$ for gasoline

on these trips. His depreciation on the car if he was using it fully for business purposes would be $$3,900.$ During the year,

he drove his car a total of $16,400$ miles $($a combination of business and personal travel$).$

Note: Do not round intermediate calculations. Round your final answers to the nearest whole dollar amount.

a$.$ Ryan can provide written documentation of the business purpose for trips totaling $3,280$ miles. What business expense amount can

Ryan deduct $($if any$)$ for these trips?