Emily, who is self$-$employed, used her personal car for business travel this year. She paid $$2,150$ for gasoline. Her car's depreciation, if fully used for business, would be $$4,600.$ Emily drove a total of $12,800$ miles during the year, with $2,400$ miles documented for business purposes. What business expense amount can Emily deduct $($if any$)$ for these trips?

David, a self$-$employed individual, used his personal vehicle for business$-$related travel. He spent $$1,800$ on gasoline. If David can provide written documentation for $2,700$ miles of business$-$related trips, what business expense amount can he deduct $($if any$)$ for these trips, given that his car's depreciation for full business use would be $$3,900?$

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