I have invested £10000 for 5 years and I how have £12763 in my account. What is my banks interest rate?
This question is an example of compound interest rates. The question asks to find the interest rate of the bank. So first of all we should form an equation relating our initial amount, interest rate, time and final amount. Our initial amount is 10000, time is 5 years and final amount is 12763. We will set our interest rate equal to y which we must find to give our answer.10000 x y5 = 12763. Therefore we can say y5 = 1.2763. We must then take the 5th root of 1.2763 to find our interest rate y which is 1.05 so our interest rate is 5% per annum.
