1. The Jankowskis purchased 235 acres of good farmland at $3,468 per acre. They paid 25 percent down and were able to obtain a loan at the rate of 7.8 percent over a 15 -year period. They are to repay the principal in equal annual payments and the interest in semiannual payments on the annual balance of the principal. a. What was the amount of the down payment? b. What was the amount of the loan? c. What was the semiannual interest payment the first year? d. What was the principal at the end of the second year