Page | 7 2.4.5.L1 Rule of 72 Note Taking Guide Total Points Earned Name Xavier Swann 18 Total Points Possible Date 03/09/2022 Percentage Class 2A CCRD What is the Rule of 72? Write the equation for the Rule of 72: The time it will take an investment to double in value at a given interest rate. 72 Interest Rate = Numbers of years to double investment What are three things the Rule of 72 can determine? How long it will take for money to double when interest is compounded The interest rate an investment must earn to double in a specific time period How many times money will double in a specified time period What are important things to know about the Rule of 72? 1. It’s only an approximation 2. Assumes the interest rate stays constant 3. Does not allow for additional contributions beyond the original principal 4. Does not account for taxes or fees 5. The rule of 72 can be applied to increasing debt. © Take Charge Today – June 2016 – Rule of 72 The University of Arizona Page | 8 2.4.5.L1 Doug invested $2,500 in a Certificate of Deposit, earning an interest rate of 6.5%, how long will it take his investment to double? (Round your answer to 2 decimal places) 11.076 6.5 How long will it take to double your investment in the stock market if the average return is 11%? (Round your answer to 1 decimal place) 6.54 11 Jessica has a balance of $2,200 on her credit card, with an interest rate of 18%. How long will it take for her debt to double? 4 18 What is a taxable account? Checking Accounts How is a tax deferred account different than a taxable account? Savings contributions taxed upon withdrawal from an investment. © Take Charge Today – June 2016 – Rule of 72 The University of Arizona