To estimate the number of years it takes a variable to double, we can use the rule of 70 or the rule of 72. It is best to use the rule of 72 if: a. The annual growth rate (percentage change) is 5% or larger. b. The annual growth rate is less than 5%. c. The annual growth rate is larger than 10%. d. The annual growth rate is less than 4%.
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- The rule of 70 and the rule of 72 are both methods used to estimate the number of years it takes for a variable to double. - The rule of 70 states that you divide 70 by the annual growth rate (as a percentage) to get the approximate number of years it takes for Show more…
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