Rule of 72
也称为: Doubling Time Rule
t \approx \frac{72}{r}
t ≈ 72 / r它计算什么
A quick mental math shortcut to estimate how many years it takes for an investment to double at a given annual rate of return.
变量
| 象征 | 姓名 | 描述 |
|---|---|---|
| t | Doubling Time | Approximate years for an investment to double |
| r | Annual Rate | Annual interest rate as a percentage (not decimal) |
工作示例
1
t = 72 / 8 = 9 years结果: ~9 years
尝试计算器
相关公式
#mental math#investing#doubling