The sixth root of 2 (which can be calculated as 2 to the power (1/6)) is 1.1225. If you subtract one, you get 0.1225, so 12.25%.
12.25%, approx.
(2)1/21 = 1.03356 (rounded)That's an annual interest of 3.356 percent.Let's try it:(1.03356)21 = 2.00009 on my calculator, which is pretty close.
Use the "rule of 72"...simply put, using compound interest you take the number 72 and divide it by the interest rate. Thus, at 5% the time to double is 14.4 years. This formula can be used for calculating a "double" for any interest rate using the same mathematical procedure.
The same time that it will take for any other amount to double. However, for the actual calculations you need to know the interest rate.
Nine years at 8%
Suppose the interest rate is r% then 2 = (1+r/100)11 so that ln(2) = 11*ln(1+r/100) Then ln(1+r/100) = ln(2) /11 so 1 +r/100 = exp[ln(2)/11] so r/100 = exp[ln(2)/11] - 1 r = 100*{exp[ln(2)/11] - 1} = 6.504 % approx.
Simple interest: 100/6 ie 16.67%
It depends on what you are investing in. If you're not a professional investor it should take about 5 years to double your investment in stocks.
Rule of 72 is a method that you can use to estimate the time your investments will double.I will give you the formulas and examples of how to apply them1) 72/interest=years2)72/years=interestExample 1: An investor is earning an interest of 10%. How many years will it take for her investments to double.Solution: 72/10= answerExample 2: An investor wants to double her money in 9 years, at what rate of interest must she earn for her investment to double in 9 years?Solution: 72/9=answer
It is approx 8.66%
12%
Rule of seventy two is used to ascertain the period by which an investment would grow by 100%. 72 divided by rate of interest would provide the approximate period by which the investment would become double. As an example, if the rate of interest is 6% per month, the investment would be doubled in ( 72/6) 12 months. Rule of 72 thus is an important tool to know the investment horizon.
Sometimes. It depends on the interest rate. The rule of 72 will tell you when your investment will double.Example(usage): you invest x dollars at 9% interest per year. 72/9 = 8It will take 8 years for your investment to reach 2x at 9% annual interest.The interest needed to double an investment in 10 years is:72/x=107.2% interestSo if your investment had an annual interest rate of 7.2% it would double in 10 years.
If you invest in any assets which yields 7.2% per week, then your investment will double. Rule of 72 states "The rule number (e.g., 72) is divided by the interest percentage per period to obtain the approximate number of periods (usually years) required for doubling." <><><> An investment that doubles in value every 10 weeks is generally a VERY risky investment. Safe investments will not normally have a rate of return of more than 500% a year.
The finance rule of 72 basically is a way to find out how long it will take for someone to double their money, given a certain interest rate. E.g. if you had an interest rate of 9% a year on an investment, it will take 72/9 = 8 years to double your initial investment.
11 years
ING is a good place to invest money especially if you want to double your interest.
turnkey projects are expensive since the donor will double the interest charge to make more profit on their investment.