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You are tearing down a building and find $1 in change that someone lost when working on the building 140 years ago. If, instead of being careless with the $1 in change, this person had deposited it into a bank and earned 2 percent interest every year for 140 years, how much would be in the account today according to the rule of 70?

a. $8
b. $32
c. $4
d. $16

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Answer:

The correct answer is D: $16

Explanation:

The rule of 70 is a means of estimating the number of years it takes for an investment or your money to double.

Number of Years to Double= 70/Annual Rate of Return

In this exercise= 70/2= 35 years

Every 35 years the investment duplicates.

35 years= $2

70 years= $4

105 years= $8

140 years= $16