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The Rule of 72 works best in the range of 5 to 10 percent, but it’s still an approximation. To calculate based on a lower interest rate, like 2 percent, drop the 72 to 71. To calculate based on ...
In finance, the rule of 72, the rule of 70 [1] and the rule of 69.3 are methods for estimating an investment's doubling time. The rule number (e.g., 72) is divided by the interest percentage per period (usually years) to obtain the approximate number of periods required for doubling.
This "Rule of 70" gives accurate doubling times to within 10% for growth rates less than 25% and within 20% for rates less than 60%. Larger growth rates result in the rule underestimating the doubling time by a larger margin. Some doubling times calculated with this formula are shown in this table. Simple doubling time formula:
Here’s how the Rule of 72 might work in the context of your retirement planning. Let’s say you’re 35 years old with $100,000 saved for retirement to date.
In the exact formulas, especially when using logs, it is standard to use the decimal form so I didn't want to change these - and I certainly didn't want to change the topics title formula to be "The Rule of 0.72"! Prefacing each formula to indicate whether the rate is a decimal or percent seemed too clumsy, so I left everything as is.
Amdahl's Law demonstrates the theoretical maximum speedup of an overall system and the concept of diminishing returns. Plotted here is logarithmic parallelization vs linear speedup. If exactly 50% of the work can be parallelized, the best possible speedup is 2 times.
Substance Formula 0 °C 10 °C 20 °C 30 °C 40 °C 50 °C 60 °C 70 °C 80 °C 90 °C 100 °C Barium acetate: Ba(C 2 H 3 O 2) 2: 58.8: 62: 72: 75: 78.5: 77: 75
25 years from publication (photographic pictures and cinematographic films and other audiovisual works; works published under unknown pseudonym or anonymously) [217]: s. 13(3)(a), (c) Suriname: Life + 50 years [218] 50 years from publication (anonymous or pseudonymous work) (art. 39) Yes Sweden: Life + 70 years [219] Yes [219] Switzerland