You use the PRI formula
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i=prt FACT: If an annual interest rate is given, time in the simple interest formula must be expressed in terms of years.
The answer for rate in simple interest is =rate= simple interest\principle*time
Annual Interest Rate divided by 12= Monthly Interest Rate
P(r/100)^2
I = prt where I = interest, p = principal, r = rate. and t = time in years.