This year, Samantha is self$-$employed. She used her personal auto for various business trips. Samantha paid $$1,950$ for gasoline on these trips. Her depreciation on the car, if fully used for business purposes, would be $$4,200.$ During the year, she drove her car a total of $14,500$ miles $($a combination of business and personal travel$).$ If Samantha can provide written documentation of the business purpose for trips totaling $2,900$ miles, what business expense amount can she deduct $($if any$)$ for these trips?

Mark is self$-$employed and used his personal vehicle for business purposes this year. He spent $$2,300$ on gasoline for these trips. If Mark can provide written documentation for business$-$related trips totaling $3,500$ miles, what business expense amount can he deduct $($if any$)$ for these trips, considering his depreciation on the car would have been $$5,000$ if fully used for business?

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