Solve the following equation: (1 + x/100)8 = 3. That is, your money increases by a certain factor each year; the factor is the capital plus the percentage rate (divided by 100), and if you multiply the factor by itself 8 times, you get a factor of 3.
To start solving this, take the 8th. root left and right.
the equation for compound interest is Pe^(rt) the principal you want in the end is twice that of the original 12,000 plugging in and solving you get 12,000=6000e^(.13t) t = 5.33 years
We still need to know how often the interest is compounded ... Weekly ? Daily ? Hourly ? What does "continuous" mean ?
The Rule of 72 states that you can estimate the number of years required to double an investment by dividing 72 by the annual interest rate. In this case, with an 8% interest rate, you would calculate 72 ÷ 8 = 9 years. Therefore, it will take approximately 9 years for Bill's $750 to double in a CD with 8% interest compounded quarterly.
3.73% would do it almost exactly: Where p is the original investment and i is the rate of interest: 3p = p((1 + i/100) to the power of 30) dividing by p gives ((1 + i/100) to the power 30) = 3 using logarithms (log 3)/30 = 1 + i/100 antilog (0.47712/30) = 1 + i/100 antilog 0.0159 = 1 + i/100 1.037299 = 1 + i/100 0.037299 = i/100 i = 3.7299 Later: I tested this on Excel with capital of 5000 and interest rate of 3.73% and after 30 years investment was worth 15000.35!
Penalty interest is calculated from the required and projected balance
It is approx 8.66%
the equation for compound interest is Pe^(rt) the principal you want in the end is twice that of the original 12,000 plugging in and solving you get 12,000=6000e^(.13t) t = 5.33 years
Approx 44.225 % The exact value is 100*[3^(1/3) - 1] %
(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.
We still need to know how often the interest is compounded ... Weekly ? Daily ? Hourly ? What does "continuous" mean ?
A good jumbo CD rate would be over 5% and one must be careful to find out how often the interest will be compounded. Also important is the minimum investment amount that would be required.
The Rule of 72 states that you can estimate the number of years required to double an investment by dividing 72 by the annual interest rate. In this case, with an 8% interest rate, you would calculate 72 ÷ 8 = 9 years. Therefore, it will take approximately 9 years for Bill's $750 to double in a CD with 8% interest compounded quarterly.
(1+x)10 = 310 log(1+x) = log(3)log(1+x) = 0.1 log(3)(1+x) = 10[0.1 log(3)] = 1.116123x = .116123 = 11.61 percent
3.73% would do it almost exactly: Where p is the original investment and i is the rate of interest: 3p = p((1 + i/100) to the power of 30) dividing by p gives ((1 + i/100) to the power 30) = 3 using logarithms (log 3)/30 = 1 + i/100 antilog (0.47712/30) = 1 + i/100 antilog 0.0159 = 1 + i/100 1.037299 = 1 + i/100 0.037299 = i/100 i = 3.7299 Later: I tested this on Excel with capital of 5000 and interest rate of 3.73% and after 30 years investment was worth 15000.35!
390.45
required rate of return is the 'interest' that investors expect from an investment project. coupon rate is the interest that investors receive periodically as a reward from investing in a bond
Future Value = (Present Value)*(1 + i)^n {i is interest rate per compounding period, and n is the number of compounding periods} Memorize this.So if you want to double, then (Future Value)/(Present Value) = 2, and n = 16.2 = (1 + i)^16 --> 2^(1/16) = 1 + i --> i = 2^(1/16) - 1 = 0.044274 = 4.4274 %