At the beginning of year 1, bode invests $250 at an annual simple interest rate of 3%. He makes no deposits to or withdrawals from the account. Which explicit formula can be used to find the account's balance at the beginning of year 14?
a. a(n)=250 (n)(0.03・250);$355.00
b. a(n)=(250)(n-1)(0.03); $97.50
c. a(n)=250 (n-1)(0.03); $250.39
d. a(n)=250 (n-1)(0.03・250);$347.50