1. (Loan amortization) On December 31, Son-Nan Chen borrowed $100,000, agreeing to repay this sum in 20 equal end-of-year installments at 15 percent interest on the declining balance. How large must...

1. (Loan amortization) On December 31, Son-Nan Chen borrowed $100,000, agreeing to repay this sum in 20 equal end-of-year installments at 15 percent interest on the declining balance. How large must the annual payments be?

2. (Loan amortization) To buy a new house you must borrow $150,000. To do this you take out a $150,000, 30-year, 10 percent mortgage. Your mortgage payments, which are made at the end of each year (one payment each year), include both principal and 10 percent interest on the declining balance. How large will your annual payments be?