How to calculate the principle amount of a compound investment? | All About Money Online

Hi, I have an assignment I’m supposed to be doing for Maths and I need to figure out the Principle amount for an investment using the length of time of the investment, the interest rate and amount of compound interest earned during the investment. Unfortunately I’m unable to find an equation or formula suitable to answering this kind of question. I’m not asking for the actual answer to my assignment but if someone would be able to provide me with a formula that would be very helpful.

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