Or interest equals principal amount times interest rate times amount of time. The formula to calculate compound interest is to add 1 to the interest rate in decimal form raise this sum to the total number of compound periods and multiply this solution by the principal. The interest rate is 6 per annum or yearly.
You can download this Interest Rate Formula Excel Template here Interest Rate Formula Excel Template.
Simple Interest Equation Principal Interest A P 1 rt Where. R Rate of Interest per year in decimal. I Interest Amount. Using this formula you will find that the amount of interest on Johns 7500 loan was 3750.