One way to find a percentage of an amount is to use 1%, 10% and 50% as building blocks. 1%, 10% and 50% can be used as building blocks for working out percentages in your head. 1% is 1⁄100.

To understand how to use a compound interest calculator, it’s helpful to know the formula behind it. The compound interest ...

How to calculate interest rate using a factor rate Factor rates are expressed as a decimal, as opposed to a percentage. Multiply the factor rate by your loan amount to determine the total amount ...