A loan of $L is being repaid with 120 payments of $1200 followed by 120 payments of $2000. Payments are made at the end of semi-annual period. The nominal rate of interest convertible semi-annually is 8%. a) Find out the outstanding balance on the loan immediately following the 60th payment. b) Calculate the amount of principal in the 61st payment. c) Calculate the total amount of interest paid from the 61st payment through the last payment.