(1) You borrow 15,000 to be paid off in 5 years with equal quarterly payments made at the end of each period. If the nominal semi-annual rate is 5%, compute the quarterly payment. (2) You make a series of deposits at the beginning of each month for 8 years. The first payment is 50. Each subsequent payment is increased by 5. If the annual effective rate is 10%, compute the accumulated balance at the end of 8 years. (3) You deposit 100 at the end of each year for 10 years into a savings account. Thereafter, deposits of 200 are made every 5 years for 20 years. If the effective rate of interest is 1.5%