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Your money doubles in 9.0 years
At 8% annual return, $1 becomes $2 in 9.0 years
Exact: 9.01 years · Rule of 72 estimate: 9.00 years
You need 7.18% annual return
To double your money in 10 years you need 7.18% per year
The S&P 500 has historically averaged ~10%. At that rate, money doubles every ~7.2 years.