Rule of 72 example Estimate how long it would take an investment of £100 to double with a compound interest rate of 3%. Then use your answer to see exactly what the answer would be after that many years. T = 72/3 = 24 So it would take approximately 24 years to double an investment at a 3% compound interest rate. Let's check: Using the formula for compound interest, what would the investment be worth after 24 years? Answer to 2 decimal places.
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