The four actors below have just signed a contract to star in a dramatic movie about relationships among hospital doctors. Each person signs independent contracts with the following terms: Contract TermsContract AmountPayment DateDerek$$600,0002$ yearsIsabel$640,0003$ yearsMeredith$500,000$TodayGeorge$500,0001$ yearRequired:$1-$a$.$ Assuming an annual discount rate of $9\%,$ calculate the present value of the contract amount$\mathrm{.}1-$b$.$ Which of the four actors is actually being paid the most?