It is the capital multiplied by the interest rate (in %) divided by 100.
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Simple interest is calculated on the principal only. If you have $1,000 and earn 5% interest per year, you will receive $50 at the end of year one. At the end of year two, you will receive another $50. And on it goes. With compound interest, you earn interest on the principal plus any interest you previously earned. Looking again at the previous example, at the end of year one you will still receive $50. At the end of year two, however, you will receive $52.50. Why? Because the 5% is paid on the principal PLUS the interest you previously earned. At the end of 10 years, you'll receive $77.57. After 20 years, $126.35. With simple interest you would still receive only $50.
Simple interest: stays the same. Compound interest: increases.
its compound interest
Calculation of simple interest is faster in comparison to compound interest. In the latter, interest is added up with the principal amount and interest is charged on that added amount in the next period calculation.
You have confused between the terms. Simple interest and interest at flat rate is one and the same. The other type of interest is diminishing balance or reducing balance. These are interests associated with loans or finances sought. Well a simple rule of thumb is that usually simple interest rate is about half of rate on reducing balance. For e. g. if rate at reducing balance is 12% then simple interest for the same will be around or just more than 6%