If you invest at a rate of return r, divide 72 by r to get the number
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Question:
If you invest at a rate of return r, divide 72 by r to get the number of years it takes to double your money.
Example 1: r = 10; n = number of years
n = 72 divided r
n = 72 / r
n = 72 / 10
n = 7.2
Example 2: r = 4; n = number of years
n = 72 divided r
n = 72 / r
n = 72 / 4
n = 18
Problem:
1. If you invest at a rate of return 5, how many years will it take to double your money?
2. If you invest at a rate of return 9, how many years will it take to double your money?
3. If you invest at a rate of return 3, how many years will it take to double your money?
4. If you invest at a rate of return 20, how many years will it take to double your money?
5. If you invest at a rate of return 15, how many years will it take to double your money?
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