How many years will it take for an initial investment of $20,000 to grow to $50,000? Assume a rate of interest of 11% compounded continuously. It will take about years for the investment to grow to $50,000. (Round to two decimal places as needed.)

Algebra and Trigonometry (6th Edition)
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### Compound Interest Growth Calculation

**Problem Statement:**
How many years will it take for an initial investment of $20,000 to grow to $50,000? Assume a rate of interest of 11% compounded continuously.

**Solution:**

The formula for continuous compounding is given by:
\[ A = P e^{rt} \]
where:
- \( A \) is the amount of money accumulated after n years, including interest.
- \( P \) is the principal amount (the initial amount of money, which is $20,000).
- \( r \) is the annual interest rate (decimal), which in this case is 11%, or 0.11.
- \( t \) is the time the money is invested for in years.
- \( e \) is the base of the natural logarithm, approximately equal to 2.71828.

We need to solve for \( t \) when \( A \) (the final amount) is $50,000.

So,
\[ 50,000 = 20,000 \times e^{0.11 t} \]

Divide both sides by 20,000:
\[ \frac{50,000}{20,000} = e^{0.11 t} \]

Simplify:
\[ 2.5 = e^{0.11 t} \]

Taking the natural logarithm on both sides:
\[ \ln(2.5) = \ln(e^{0.11 t}) \]

By the properties of logarithms:
\[ \ln(2.5) = 0.11 t \]

Therefore,
\[ t = \frac{\ln(2.5)}{0.11} \]

Calculate the value (using a calculator):
\[ t \approx \frac{0.916}{0.11} \]
\[ t \approx 8.33 \]

So, it will take about 8.33 years for the investment to grow to $50,000.

**Final Answer:**
It will take about \(\boxed{8.33}\) years for the investment to grow to $50,000. 

Please enter your answer in the box and then click "Check Answer".
Transcribed Image Text:### Compound Interest Growth Calculation **Problem Statement:** How many years will it take for an initial investment of $20,000 to grow to $50,000? Assume a rate of interest of 11% compounded continuously. **Solution:** The formula for continuous compounding is given by: \[ A = P e^{rt} \] where: - \( A \) is the amount of money accumulated after n years, including interest. - \( P \) is the principal amount (the initial amount of money, which is $20,000). - \( r \) is the annual interest rate (decimal), which in this case is 11%, or 0.11. - \( t \) is the time the money is invested for in years. - \( e \) is the base of the natural logarithm, approximately equal to 2.71828. We need to solve for \( t \) when \( A \) (the final amount) is $50,000. So, \[ 50,000 = 20,000 \times e^{0.11 t} \] Divide both sides by 20,000: \[ \frac{50,000}{20,000} = e^{0.11 t} \] Simplify: \[ 2.5 = e^{0.11 t} \] Taking the natural logarithm on both sides: \[ \ln(2.5) = \ln(e^{0.11 t}) \] By the properties of logarithms: \[ \ln(2.5) = 0.11 t \] Therefore, \[ t = \frac{\ln(2.5)}{0.11} \] Calculate the value (using a calculator): \[ t \approx \frac{0.916}{0.11} \] \[ t \approx 8.33 \] So, it will take about 8.33 years for the investment to grow to $50,000. **Final Answer:** It will take about \(\boxed{8.33}\) years for the investment to grow to $50,000. Please enter your answer in the box and then click "Check Answer".
**Investment Growth Calculation**

**Problem Statement:**
How many years will it take for an initial investment of $20,000 to grow to $50,000? Assume a rate of interest of 11% compounded continuously.

**Solution:**
It will take about _______ years for the investment to grow to $50,000.  
*(Round to two decimal places as needed.)*

**Input Instructions:**
Enter your answer in the answer box and then click Check Answer.  
*(Buttons for clearing the answer and checking the answer are also present.)*
Transcribed Image Text:**Investment Growth Calculation** **Problem Statement:** How many years will it take for an initial investment of $20,000 to grow to $50,000? Assume a rate of interest of 11% compounded continuously. **Solution:** It will take about _______ years for the investment to grow to $50,000. *(Round to two decimal places as needed.)* **Input Instructions:** Enter your answer in the answer box and then click Check Answer. *(Buttons for clearing the answer and checking the answer are also present.)*
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