The formula for the rule of 70, where n is number of years and r is growth rate, is expressed as:

Question

Quizplus · Accepted Answer

The correct formula for the rule of 70, which is used to estimate the number of years it will take for an investment or population to double at a given annual growth rate, is expressed as $ n = \frac{70}{r} $. However, none of the provided options exactly match this formula. The closest option, when rearranged, is D) $ n * r = 70 $, which can be rewritten to resemble the correct formula by dividing both sides by $ r $, thus giving $ n = \frac{70}{r} $.

The Formula for the Rule of 70, Where N Is