Быстрый расчёт срока удвоения капитала или нужной ставки доходности
The Rule of 72 is a quick mental-math shortcut to estimate how long it takes to double capital at a given return, or what rate is needed to double money within a target period.
Doubling time (years) = 72 / rate%. Required rate (%) = 72 / years. Based on the approximation: compound doubling time = ln(2)/ln(1+r) ≈ 0.693/r ≈ 72/r%.
Deposit at 12%: 72 / 12 = 6 years to double. Want to double in 9 years: 72 / 9 = 8% annual return needed.
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