5) Determine the time it takes an amount of money to triple if compounded continuously

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
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Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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**Problem 5:** Determine the time it takes an amount of money to triple if compounded continuously at an annual rate of 12%.

*Explanation:*

To solve this problem, you would use the formula for continuous compounding, which is based on the equation:

\[ A = Pe^{rt} \]

Where:
- \( A \) is the amount of money after time \( t \).
- \( P \) is the principal amount (initial amount).
- \( r \) is the annual interest rate (as a decimal).
- \( t \) is the time in years.
- \( e \) is the base of the natural logarithm.

Since the goal is for the money to triple, we have \( A = 3P \). Substituting into the formula gives us:

\[ 3P = Pe^{0.12t} \]

By dividing both sides by \( P \) (assuming \( P \neq 0 \)), we get:

\[ 3 = e^{0.12t} \]

Taking the natural logarithm of both sides:

\[ \ln(3) = 0.12t \]

Solving for \( t \):

\[ t = \frac{\ln(3)}{0.12} \]

This result gives you the time it takes for the money to triple. You can calculate this using a calculator to find the exact number of years.
Transcribed Image Text:**Problem 5:** Determine the time it takes an amount of money to triple if compounded continuously at an annual rate of 12%. *Explanation:* To solve this problem, you would use the formula for continuous compounding, which is based on the equation: \[ A = Pe^{rt} \] Where: - \( A \) is the amount of money after time \( t \). - \( P \) is the principal amount (initial amount). - \( r \) is the annual interest rate (as a decimal). - \( t \) is the time in years. - \( e \) is the base of the natural logarithm. Since the goal is for the money to triple, we have \( A = 3P \). Substituting into the formula gives us: \[ 3P = Pe^{0.12t} \] By dividing both sides by \( P \) (assuming \( P \neq 0 \)), we get: \[ 3 = e^{0.12t} \] Taking the natural logarithm of both sides: \[ \ln(3) = 0.12t \] Solving for \( t \): \[ t = \frac{\ln(3)}{0.12} \] This result gives you the time it takes for the money to triple. You can calculate this using a calculator to find the exact number of years.
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