Question
If the rate of inflation is \( 2.6 \% \) per year, the future price \( p(t) \) (in dollars) of a certain item can be modeled by the following exponential function, where \( t \) is the number of years from today. \[ p(t)=2500(1.026)^{t} \] Find the current price of the item and the price 10 years from today. Round your answers to the nearest dollar as necessary. Current price: Price 10 years from today: \( \$ \square \)
Ask by Barnett Goodwin. in the United States
Mar 15,2025
Upstudy AI Solution
Tutor-Verified Answer
Answer
Current price: \$2500
Price 10 years from today: \$3233
Solution
**Step 1. Find the current price**
The current price is given by \( p(0) \). Plug \( t = 0 \) into the equation:
\[
p(0)=2500(1.026)^0=2500(1)=2500.
\]
Thus, the current price is \$2500.
**Step 2. Find the price 10 years from today**
The price 10 years from today is \( p(10) \). Substitute \( t = 10 \) into the function:
\[
p(10)=2500(1.026)^{10}.
\]
Calculate \( (1.026)^{10} \):
One way to do this is to use logarithms, noticing that
\[
(1.026)^{10}=\exp(10\ln(1.026)).
\]
Approximating, we have
\[
\ln(1.026) \approx 0.0257, \quad 10\ln(1.026) \approx 0.257,
\]
and
\[
\exp(0.257) \approx 1.293.
\]
Thus,
\[
p(10) \approx 2500 \times 1.293 \approx 3232.5.
\]
Rounding to the nearest dollar,
\[
p(10) \approx 3233.
\]
**Final Answers**
Current price: \$2500
Price 10 years from today: \$3233
Answered by UpStudy AI and reviewed by a Professional Tutor
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Bonus Knowledge
The current price of the item is given directly by the initial value in the exponential function. Thus, the current price is \( p(0) = 2500(1.026)^{0} = 2500 \). To find the price 10 years from today, substitute \( t = 10 \) into the function: \[ p(10) = 2500(1.026)^{10} \approx 2500 \times 1.28008 \approx 3200.20 \] Rounding to the nearest dollar, the price 10 years from today is \( \$3200 \). Current price: \( \$2500 \) Price 10 years from today: \( \$3200 \)