Rule of 72

Source: https://betterexplained.com/articles/the-rule-of-72/

Years to double = 72 / Interest Rate

• If inflation rates go from 2% to 3%, your money will lose half its value in 24 years instead of 36.
• If population grows at 2% rate, it will double in 36 years.
• If Bank offers 10% interest rate, your money will double in 7.2 years