Rule of 72
としても知られています: Doubling Time Rule
t \approx \frac{72}{r}
t ≈ 72 / r計算内容
A quick mental math shortcut to estimate how many years it takes for an investment to double at a given annual rate of return.
変数
| シンボル | 名前 | 説明 |
|---|---|---|
| t | Doubling Time | Approximate years for an investment to double |
| r | Annual Rate | Annual interest rate as a percentage (not decimal) |
実用例
1
t = 72 / 8 = 9 years結果: ~9 years
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関連する式
#mental math#investing#doubling