The rule of 72 for compound interest | Interest and debt | Finance & Capital Markets | Khan Academy
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Using the Rule of 72 to approximate how long it will take for an investment to double at a given interest rate. Created by Sal Khan.
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Finance and capital markets on Khan Academy: Interest is the basis of modern capital markets. Depending on whether you are lending or borrowing, it can be viewed as a return on an asset (lending) or the cost of capital (borrowing). This tutorial gives an introduction to this fundamental concept, including what it means to compound. It also gives a rule of thumb that might make it easy to do some rough interest calculations in your head.
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