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FORMULA RULE OF 72
How to calculation double your money as given the interest rate?
you have follow FORMULA ""Rule of 72""
1. The rule says that to find the number of years required to double your money at a given interest rate, you
just divide the interest rate into 72.
for example:-
if you want to know how long it will take to double your money at eight percent interest, divide 8 into 72 and get 9 years.
72÷8 =9
（72 is Formula Rule）
（8 is the interest rate by given）
（9 is the answer of how many year you will double your money）