A) The APR of a loan is 5.7%. The customer needs to make 5 payments each year. The loan must be paid off in 14 years. Suppose the principal of the loan is $66,417. Find the simple sum of interest payments that the customer makes in the first 3 years.

B) The effective annual interest rate of a loan is 8.9% (note: it is not the APR). The customer needs to make 4 payments each year. The loan must be paid off in 8 years. Suppose the principal of the loan is $78,456. The payment in each period is $_____.

C) The effective annual interest rate of a loan is 8.0%. The customer needs to make 4 payments a year. The APR of the loan is ____%.