Remember to use the decimal form for the interest rate, i
Worked example 2
Helene invests a certain amount of money in a savings account for fi ve years. The account pays interest at a rate of 4% compounded annually. At the end of the fi ve years, Helene had €1 825 in her savings account.
Calculate how much she invested, correct to the nearest euro. Solution
Worked example 3
Fionn has €10 000 and wants to invest it for fi ve years. A special savings account is off ering a compound interest rate of 3 ⋅ 5% for the fi rst two years and a higher rate for the fi nal three years, provided no money is withdrawn from the account for fi ve years.
(i) How much will the investment be worth at the end of the fi rst two years?
(ii) If the fi nal amount at the end of fi ve years was €12 758 ⋅ 46, calculate the rate of compound interest for the fi nal three years, to the nearest percent.