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It is called the rule of 72. You take the interest rate you will be receiving and divide that number into 72. the answer will be the number of years it will take you to double your money at that interest rate.
How long it will take for your money to double/divide the annual interest rate into 72.
Solve, using the Rule of 72 rate = 4%, years = 18, fv=$8,000. Solve for PV. Formula: PV = $1/(1+r) t PV = $8000/(1+.04) 18 PV = $8000/2.0258 3949.03 = $8000/2.20258
formula- a rule or principle, frequently expressed in algebraicsymbols.
Benjamin Franklin came up with this equation.