1. An investment of R7 500 grows to an amount of R10 200 where interest is compounded quarterly over three years. What is the annual rate of interest?
2. Find the interest rate required for an investment of R5 000 to grow to R8 000 in four years if interest is compounded monthly.
3. How much must an investor deposit today to withdraw R25 000 after two years and nine months from an investment that pays interest at 9% p.a. compounded quarterly?
4. If R21 353.40 is invested at 12% p.a. compounded annually, how long will it take for the capital plus the interest to amount to R30 000?