Simple Interest Formulas and Calculations:
Formulas involving simple interest where P is the Principal amount of money to be invested at an Interest Rate r% per
period for t Number of Time Periods. Where r is in decimal form; r and t are in the same units of time.

Calculate Interest

Calculate Principal Amount, solve for P

Calculate rate of interest in decimal, solve for r

Calculate rate of interest in percent

Calculate time, solve for t
Principal + Interest: A = P(1 +
rt)
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