Michelle is self$-$employed and uses her personal automobile for business trips. During $2022,$ Michelle drives her car $70\%$ for business use and incurs the following total expenses $($based on $100\%$ use of car$)$:View the expenses.LOADING...Michelle drives her car a total of $30$ comma $000$ miles $(21$ comma $000$ business miles$)$ during $2022.$Read the requirements.LOADING...a$.$What amount is deductible if Mary uses the standard mileage method?b$.$What amount is deductible if Mary uses the actual cost method?c$.$Can taxpayers switch back and forth between the mileage and actual methods each year?$($The standard mileage rate method permits a deduction based on a mileage rate of $58\mathrm{.}5$ cents per mile for the year $2022.)$