A loan with an interest rate of 4.2% compounded quarterly was obtained for $45,000. The payments towards the loan are $400 every month for 12 years. 1. Determine the principal repaid in the 80 th payment. 2. Determine the interest paid in the 65th payment. 3. Determine the interest paid in the 7 th year. 4. Determine the final payment. 1. Determine the principal repaid in the 80th payment