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Simple Interest (SI) = (Principal x Rate x Time) / 100
Compound Interest (CI) = Principal x [(1 + Rate/100)^Time] - Principal
EMI Formula = [P x R x (1+R)^N] / [(1+R)^N - 1]
Where P = Principal, R = Monthly interest rate, N = Number of months
Rule of 72 (SHORTCUT): Number of years to double money = 72 / Rate of Interest
Example: At 8% interest, money doubles in 72/8 = 9 years.
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