a) What will a $100 investment be worth in three years time if the rate of interest is 8 per cent, using: simple interest? annual compound interest? b) You plan to invest $10,000 in the shares of a company. - If the value of the shares increases by 5 per cent a year, what will be the value of the shares in 20 years? - If the value of the shares increases by 15 per cent a year, what will be the value of the shares in 20 years? c) How long will it take you to double your money if you invest it at: - 5 per cent? - 15 per cent?