According to the rule of 70, if you earn an interest rate of 3.5 percent, your savings will double about every 20 years.

Name: According to the rule of 70, if you earn an interest rate of 3.5 percent, your savings will double about every 20 years.
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The rule of 70 is a way to estimate the number of years it takes for an investment to double at a given annual interest rate. By dividing 70 by the interest rate (3.5), you get approximately 20 years.

According to the Rule of 70, If You Earn an Interest