1. How many mortgage payments were left on Harry's house if the remaining balance is $72,375.15 given that he purchased it at 14% interest and has been making a monthly payment of $900?
2. What is the semiannual payment to finance $200,000 in a sinking fund that pays 12% annual interest? Also, calculate the total deposits of the sinking fund and the interest earned by the semiannual payment.