The rule says that to find the number of years required to double your money at a given interest rate, you just divide the interest rate into 72. For example, if you want to know how long it will take to double your money at eight percent interest, divide 8 into 72 and get 9 years.

At what annual rate of interest compounded yearly Will money double in 8 years?

12.5% per annum
According to Simple Interest (S.I) formula. . Where P is principal amount, R is rate of interest and T will be time period. Hence, the rate of interest to double a money in 8 years will be 12.5% per annum.

What annual rate of interest is required to double an investment in 9 years?

For example, if an investment scheme promises an 8% annual compounded rate of return, it will take approximately nine years (72 / 8 = 9) to double the invested money.

What interest rate do you need to double your money in 5 years?

14.4%
For example if you wanted to double an investment in 5 years, divide 72 by 5 to learn that you’ll need to earn 14.4% interest annually on your investment for 5 years: 14.4 × 5 = 72. The Rule of 72 is a simplified version of the more involved compound interest calculation.

How to calculate the number of years to Double Your Investment?

You can calculate the number of years to double your investment at some known interest rate by solving for t: t = 72 ÷ R. You can also calculate the interest rate required to double your money within a known time frame by solving for R: R = 72 ÷ t.

How to calculate compound interest for any investment?

One can use it for any investment as long as it involves a fixed rate with compound interest in reasonable range. Simply divide the number 72 by the annual rate of return to determine how many years it will take to double. For example, $100 with a fixed rate of return of 8% will take approximately nine (72 / 8) years to grow to $200.

How long does it take for interest to double?

For example, if the interest rate earned is 6%, it will take 12 years (72 divided by 6) for your money to double. If you want your money to double every 8 years, you will need to earn an interest rate of 9% (72 divided by 8).

How to calculate the rule of 72 for compound interest?

Rule of 72 Formula. The Rule of 72 is a simple way to estimate a compound interest calculation for doubling an investment. The formula is interest rate multiplied by the number of time periods = 72: R * t = 72. where. R = interest rate per period as a percentage.