The "rule of 72" says that the doubling time in years is approximately 72 divided by the interest rate in percent. To make the money grow by a factor of 4 requires that it double twice, so will take twice as long as the period to double once.
2×72/11.3 ≈ 12.7 . . . . years
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The "rule of 72" is an approximation. The actual quadrupling time for this interest rate and compounding is about 12.6 years. (The actual product of doubling time and nominal interest rate is about 71.25.)
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Step-by-step explanation:
Answer:
Step-by-step explanation:
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You need 12 square roots of 1764 ?
<span>Why not find the square root of 1764 first (it's 42) and then take 12 of those ?
Hope this helps!</span>
6 1/10 + 5 9/12 = 11 17/20
