Mathematics 0580 · IGCSE · Exponential growth and decay
Exponential growth and decay — practice question
As soon as Heidi was born, her grandfather placed some money into an account that paid compound interest. The graph illustrates the exponential increase of this investment.
(a(i))[1]
Use the graph to determine the starting amount of money invested.
(a(ii))[1]
Use the graph to determine how many years it took the original amount to double.
(a(iii))[1]
Use the graph to determine the investment value after 54 years.
(b)[2]
Use your answers to part (a)(i) and part (a)(ii) to set down an equation involving r. You do not need to solve the equation.
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “$20$” …