Use the following formula. nt r P[(+)-1] n 8 Suppose that you drive 30,000 miles per year and gas averages $4 per gallon. Complete parts a. and b. below. A = a. What will you save in annual fuel expenses by owning a hybrid car averaging 30 miles per gallon rather than an SUV averaging 9 miles per gallon? $ (Round to the nearest dollar as needed.) b. If you deposit your monthly fuel savings at the end of each month into an annuity that pays 5.6% compounded monthly, how much will have saved at the end of four years? (Round to the nearest dollar as needed.)