An equation for finding simple interest rate

See below.

Step-by-step explanation:

I = PRT/100  will do it.

I = Simple interest.

P =  Principal ( Intial Amount invested).

R = Rate (as a percent).

T = time invested.

The above formula gives the amount of interest,   If you want to find the interest rate  knowing all the other values you have to solve for R:

I = PRT/100

100 I = PRT

R = 100I / PT  is the formula .

answer is d-29

step-by-step explanation:

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step-by-step explanation:

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