The simple interest, I, on a deposit of C, at an interest rate of r% per year, deposited for y years, is calculated as
I = C*(r/100)*y
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There is simple interest and there is compound interest but this question is the first that I have heard of a simple compound interest.
It is interest on simply the original capital. After the first period, compound interest involves interest on the interest earned in previous periods and soit not simple.
Simple interest is calculated one time @ a specified rate over a specific length of time. Compound interest is calculated multiple times @ a specified rated divided by the number of given periods within a specified time. example: $100 @ 10% interest over 1 year. Simple interest: principle x rate x time = interest; $100 x .10 x 1 = $10 example: $100 @ 10% interest compounded quarterly over 1 year. Compound interest: principle x {(1 + rate / #periods)n} = interest $100 x {(1 + .10 / 4 )^4} = $100 x (1 .025 )^4 = $100 x 1.1038 = $10.38
compound
Simple interest = 1000 * 5/100 * 3 = 150