What interest rate will double money in 10 years?
What interest rate will double money in 10 years? 7.1% PPF at an annual interest rate of 7.1% will take around 10 years to double your money assuming the interest rate remains at 7.1% (72/7.1 =10.14). Is the Rule of 72 accurate? The Rule of 72 is a simplified formula that calculates how long it'll take for an investment to double in value, based on its rate of return. The Rule of 72 applies to compounded interest rates and is reasonably accurate for interest rates that fall in the range of 6% and 10%. How do you calculate compound interest...