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what is the formula for doubling numbers. Doubling time can be calculated by dividing the natural logarithm of 2 by the natural logarithm of the exponent of growth 1 rate per period. This law makes good predictions since the beginning of the 1990s but it wont last forever.
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To calculate the Rule of 72 you divide the number 72 by the. Doublingtime fracln2ln1r its important to notice that r is the rate per period. The rule of 72 is found by dividing 72 by the rate of interest expressed as a whole number.
Doublingtime fracln2ln1r Doubling time can also be calculated with help of the rule of 72 the rule of 70 or the rule of 639.
For example a rate of 6 would be estimated by dividing 72 by 6 which would result in 12 years. As per the formula to calculate doubling time just divide constant growth rate by 100 and add it with 1 and find the log of the answer and then divide log 2 by the answer. Doubling Time is calculated using the formula given below Doubling Time Ln 2 Ln 1r In this formula use the absolute value of r and not the decimal value. Doubling time will be expressed in monthsquarters.
