4.23. Suppose that $12,000 is placed in a bank account at the end of each quarter over the next 15 years. What is the future worth at the end of 15 years when the interest rate is 8.5% compounded at the given intervals? (a) Quarterly (b) Monthly (c) Continuously 4.31. What is the future worth of the following series of payments? (a) $75,000 at the end of each six-month period for ten years at 10.2% compounded semi-annually. (b) $25,000 at the end of each quarter for twelve years at 9.2% compounded quarterly. (c) $22,000 at the end of each month for eight years at 8.4% compounded monthly. 4.43. You borrowed $35,000 to buy a new car from a bank at an interest rate of 10.2% compounded monthly. This loan will be repaid in 96 equal monthly install- ments over eight years. Immediately after the 36th payment, you desire to pay the remainder of the loan in a single payment. Compute this lump-sum amount. 4.23. Suppose that $12,000 is placed in a bank account at the end of each quarter over the next 15 years. What is the future worth at the end of 15 years when the interest rate is 8.5% compounded at the given intervals? (a) Quarterly (b) Monthly (c) Continuously 4.31. What is the future worth of the following series of payments? (a) $75,000 at the end of each six-month period for ten years at 10.2% compounded semi-annually. (b) $25,000 at the end of each quarter for twelve years at 9.2% compounded quarterly. (c) $22,000 at the end of each month for eight years at 8.4% compounded monthly. 4.43. You borrowed $35,000 to buy a new car from a bank at an interest rate of 10.2% compounded monthly. This loan will be repaid in 96 equal monthly install- ments over eight years. Immediately after the 36th payment, you desire to pay the remainder of the loan in a single payment. Compute this lump-sum amount