Albert Einstein said that compound interest was the most powerful thing I have ever witnessed Work through the following exercises to discover a pattern Einstein discovered which is now known as the Rule of 72 a Suppose that you invest $2,000 at a 1 annual interest rate Use your calculator to input different values for t in the compound interest formula What whole number value of t will yield an amount closest to twice the initial deposit b Suppose that you invest $4,000 at a 2 annual interest rate Use your calculator to input different values for t in the compound interest formula What whole number value of t will yield an amount closest to twice the initial deposit c Suppose that you invest $20,000 at a 6 annual interest rate Use your calculator to input different values for t in the compound interest formula What whole number value of t will yield an amount closest to twice the initial deposit d Albert Einstein noticed a very interesting pattern when an initial deposit doubles In each of the three examples above, multiply the value of t that you determined times the percentage amount For example, in a multiply t by 1 What do you notice e Einstein called this the Rule of 72 because for any initial deposit and for any interest percentage, 72 (percentage) will give you the approximate number of years it will take for the initial deposit to double in value Einstein also said that If people really understood the Rule of 72 they would never put their money in banks Suppose that a 10 year old has $500 to invest She puts it in her savings account that has a 1 75 annual interest rate How old will she be when the money doubles

Question: Albert Einstein said that compound interest was . . . the most powerful thing I have ever witnessed. Work through the following exercises to discover

Albert Einstein said that was ". . . the most powerful thing I have ever witnessed." Work through the following exercises to discover a pattern Einstein discovered which is now known as the Rule of 72.
a. Suppose that you invest $2,000 at a 1% annual interest rate. Use your calculator to input different values for t in the formula. What whole number value of t will yield an amount closest to twice the initial deposit?
b. Suppose that you invest $4,000 at a 2% annual interest rate. Use your calculator to input different values for t in the formula. What whole number value of t will yield an amount closest to twice the initial deposit?
c. Suppose that you invest $20,000 at a 6% annual interest rate. Use your calculator to input different values for t in the formula. What whole number value of t will yield an amount closest to twice the initial deposit?
d. Albert Einstein noticed a very interesting pattern when an initial deposit doubles. In each of the three examples above, multiply the value of t that you determined times the percentage amount. For example, in a. multiply t by 1. What do you notice?
e. Einstein called this the Rule of 72 because for any initial deposit and for any interest percentage, 72 ÷ (percentage) will give you the approximate number of years it will take for the initial deposit to double in value. Einstein also said that "If people really understood the Rule of 72 they would never put their money in banks." Suppose that a 10-year-old has $500 to invest. She puts it in her savings account that has a 1.75% annual interest rate. How old will she be when the money doubles?

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