The Rule of 72 offers a quick way to estimate how many years it takes for an investment like ₹5 lakh to double into ₹10 lakh based on annual returns. For example, at 8% interest from a fixed deposit, it takes about 9 years (72/8=9); savings accounts at 4% need 18 years; and mutual funds at 13% can achieve it in roughly 5.5 years.
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