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# Case: Quick Way to Calculate Compounded Interest

Hi everyone!

I know the formula for the investment with compounded interest (V=P[1+(r/n)^n*t]), but do you know of good ways to quickly calculate it in your head?

Like for example when you have an annual growth of 5% for 10, 50 or 70 years or so, how could you quickly estimate it during the case interview?

(editiert)

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Ever heard of the rule of 70?
For relatively low percentages (<10%) you can approximate the time to double an amount by dividing 70 by the percentage number.

So at 2% interest, your money will (roughly) double in 35 years, at 3% it would take you about 23 years.

This will of course not anwer every question, but it may give you some helpful guidance.

Dear Anonymous C,

thank you for asking your question on our Forum and taking part in the discussion :)

If you have further questions on quick NPV calculations, feel free to open a new thread on our Forum!

Astrid

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