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Well, there is the handy “Rule of 72″, which says the number of years it takes for the money to double at x% yearly (compounded) rate is roughly 72 divided by x. For example, if you have $10,000 in a money market fund earning a sedate 5%, it will grow to $20,000 in about 14 (=72/5) years. By contrast, if the same $10,000 is invested fully in a stock fund that appreciates at a healthy 10% (not a fairytale), doubling your kitty should take only 7 years.
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