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How long does it take to double your money?



Years    Annual % rate needed
2           35.16
3           23.33
4           17.45
5           13.94
6           11.6
7           9.94    (see rule of 72)    
8           8.7
9           7.73
10          6.95
11          5.79
72          1
7200        0.01    2021 Money Market Rates