Simple interest is obtained where you take the interest every year/set period as opposed to compund interest where interest is calculated on the previous answer.
For Example: Adding 10% Interest, Starting With 100.
Simple: 100, 110, 120, 130...
Compund: 100, 110, 121, 133.1...
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Compound interest gives you more, but at a low interest rate (less than 10%), the difference is negligible.
f(x)= mx+b for simple interest t(n)= abx for compound interest
4500 + (45 x 13 x 7) = 8595 simple interest. 4500 x (1.13)7 = 10586 annual compound interest
the formula for simple interest is I=PRT (interest=principal x rate x time )
simple interest = principle (money) times the rate times the time