Interest Principal Rate of interest Time. One fund pays 7 simple interest annually while the second fund pays 75 simple interest annually. We can use the simple interest formula to find a formula for the amount of money A that will be in a simple interest account after t years.
A P I P Prt.
Simple interest formula is given as. The Formula for simple interest is used to calculate the interest amount if time and the principal amount are known. Examples of finding the interest earned with the simple interest formula Example. R and t are in the same units of time.