I = prt where I = interest, p = principal, r = rate. and t = time in years.
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The answer for rate in simple interest is =rate= simple interest\principle*time
i=prt FACT: If an annual interest rate is given, time in the simple interest formula must be expressed in terms of years.
P(r/100)^2
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I= Prt I=interest P=principal r=rate t=time