
Concept explainers
To determine how long it would take to triple money if it is invested at a rate of 6% compounded annually.

Answer to Problem 12P
Hence time to take double the money is 11.67 years
Explanation of Solution
Given information:
Rate = 6%
Doubling rate is given by formula,
Where
We have to solve for
Now we put
Hence we get,
Sometimes this is directly used to calculate the doubling time when the interest is compounded annually. (Called rule of 70)
Hence time to take double the money is
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