Calculate the future value of an annuity for each of the following cases: (a) RM3,000 per month for 5 years at interest rate 9% compounded monthly. (b) RM100,000 per month for 20 years at interest rate 7% compounded every year. (c) RM600 every 3 months for 7.5 years at interest rate 10% compounded 4 times in a year.