Pregunta
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rou deposit \( \$ 3000 \) into an account that earns \( 5 \% \) Thempounded annually. A friend deposits \( \$ 2250 \) into an Thecount that earns \( 4.95 \% \) annual interest, compounded continuously. Will your friend's balance ever equal ours? If so, when? If not, enter NEVER. nearest whole year). help (numbers)

Ask by Schwartz Bowen. in South Africa
Mar 08,2025

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After approximately 405 years, your friend's balance will equal yours.

Solución

We set up the two growth formulas. For your account (compounded annually), the balance after \( t \) years is \[ A(t) = 3000(1.05)^t. \] For your friend’s account (compounded continuously), the balance after \( t \) years is \[ B(t) = 2250\,e^{0.0495\,t}. \] We want to find \( t \) such that \[ 3000(1.05)^t = 2250\,e^{0.0495\,t}. \] 1. Divide both sides by \( 2250 \): \[ \frac{3000}{2250}(1.05)^t = e^{0.0495\,t}. \] Simplify \( \frac{3000}{2250} \) to obtain: \[ \frac{4}{3}(1.05)^t = e^{0.0495\,t}. \] 2. Take the natural logarithm of both sides: \[ \ln\left(\frac{4}{3}(1.05)^t\right) = \ln\left(e^{0.0495\,t}\right). \] Use the logarithm properties: \[ \ln\left(\frac{4}{3}\right) + t\,\ln(1.05) = 0.0495\,t. \] 3. Isolate the \( t \)-terms: \[ \ln\left(\frac{4}{3}\right) = t\left(0.0495 - \ln(1.05)\right). \] 4. Solve for \( t \): \[ t = \frac{\ln\left(\frac{4}{3}\right)}{0.0495 - \ln(1.05)}. \] 5. Compute the numerical values: - \(\ln\left(\frac{4}{3}\right) \approx 0.287682072\), - \(\ln(1.05) \approx 0.048790164\). Then, \[ 0.0495 - 0.048790164 \approx 0.000709836, \] and \[ t \approx \frac{0.287682072}{0.000709836} \approx 405.27. \] Rounding to the nearest whole year, the friend’s balance will equal your balance in approximately \[ \boxed{405} \text{ years}. \] Thus, yes, your friend’s balance will eventually equal yours after about 405 years.

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The Deep Dive

To determine if your friend's balance will ever equal yours, we first need to formulate the equations for both accounts. Your account balance after \( t \) years can be represented by the formula: \[ A = P(1 + r)^t \] where \( P = 3000 \) and \( r = 0.05 \). So, \[ A = 3000(1 + 0.05)^t = 3000(1.05)^t. \] Your friend's balance, using the formula for continuous compounding, is given by: \[ A = Pe^{rt} \] which translates to \[ A = 2250e^{0.0495t}. \] Next, we set these equal to find \( t \): \[ 3000(1.05)^t = 2250e^{0.0495t}. \] Solving this equation may require some trial and error with respect to values of \( t \) or employing logarithmic manipulation to find an exact solution. However, based on numerical analysis or graphing, you will find that your friend's account will NEVER reach the amount in your account.

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