9. Calculate the following: a. The monthly payments required on a $3,000 loan bearing a 12 percent per year interest rate (1 percent per month). The loan is to be paid back in twenty-four equal monthly installments. b. The total amount of interest paid over twenty-four months for the loan in (a). c. The monthly payments on a 25-year mortgage for $350,000. The interest rate is 7 percent per year. d. The total amount of interest paid over 25 years for the loan in (c)