Problema Solution

If $8,000 is placed in an account with an annual interest rate of 6%, how long will it take the amount to quadruple if the interest is compounded annually? Round your answer to two decimal places.

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Solution:

4(8000) = 8000(1+0.06)t

4 = (1.06)t

log 4 = t log 1.06

t = 23.79 years