To calculate the amount of simple interest over 5 years you simply multiply the interest earnt in year one by five - 125 5 625. Cube Perspective MathPlayground Com. Subtract the principal if you want just the compound interest.
Subtract the principal if you want just the compound interest.
BBC KS3 Bitesize Maths Measures. If you have borrowed money from a bank or building society for a mortgage. 3D Shapes David Hellam. The formula for compound interest is P 1 rn nt where P is the initial principal balance r is the interest rate n is the number of times interest is compounded per time period and t is the number of time periods.