Question
If the rate of inflation is \( 3.9 \% \) 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. \[ p(t)=1200(1.039)^{t} \] Find the current price of the item and the price 8 years from today. Round your answers to the nearest dollar as necessary. Current price: Price 8 years from today:
Ask by Perkins Lewis. in the United States
Mar 15,2025
Upstudy AI Solution
Tutor-Verified Answer
Answer
The current price of the item is $1200, and the price 8 years from today is approximately $1630.
Solution
To find the current price of the item and the price 8 years from today, we need to calculate the values of \( p(0) \) and \( p(8) \) using the given exponential function \( p(t) = 1200(1.039)^{t} \).
1. Current price:
To find the current price, we substitute \( t = 0 \) into the function:
\[ p(0) = 1200(1.039)^{0} \]
Since any number raised to the power of 0 is 1, the current price is:
\[ p(0) = 1200 \]
2. Price 8 years from today:
To find the price 8 years from today, we substitute \( t = 8 \) into the function:
\[ p(8) = 1200(1.039)^{8} \]
We can calculate this value using a calculator or by simplifying the expression:
\[ p(8) = 1200(1.039)^{8} \]
Now, let's calculate the values of \( p(0) \) and \( p(8) \) to find the current price and the price 8 years from today.
Calculate the value by following steps:
- step0: Calculate:
\(1200\times 1.039^{0}\)
- step1: Evaluate the power:
\(1200\times 1\)
- step2: Multiply:
\(1200\)
Calculate or simplify the expression \( 1200*(1.039)^8 \).
Calculate the value by following steps:
- step0: Calculate:
\(1200\times 1.039^{8}\)
- step1: Convert the expressions:
\(1200\left(\frac{1039}{1000}\right)^{8}\)
- step2: Simplify:
\(1200\times \frac{1039^{8}}{1000^{8}}\)
- step3: Rewrite the expression:
\(200\times 6\times \frac{1039^{8}}{1000^{8}}\)
- step4: Rewrite the expression:
\(200\times 6\times \frac{1039^{8}}{200^{8}\times 5^{8}}\)
- step5: Reduce the numbers:
\(6\times \frac{1039^{8}}{200^{7}\times 5^{8}}\)
- step6: Rewrite the expression:
\(2\times 3\times \frac{1039^{8}}{200^{7}\times 5^{8}}\)
- step7: Rewrite the expression:
\(2\times 3\times \frac{1039^{8}}{8^{7}\times 25^{7}\times 5^{8}}\)
- step8: Rewrite the expression:
\(2\times 3\times \frac{1039^{8}}{2^{21}\times 25^{7}\times 5^{8}}\)
- step9: Reduce the numbers:
\(3\times \frac{1039^{8}}{2^{20}\times 25^{7}\times 5^{8}}\)
- step10: Multiply the fractions:
\(\frac{3\times 1039^{8}}{2^{20}\times 5^{22}}\)
The current price of the item is $1200, and the price 8 years from today is approximately $1629.69.
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The Deep Dive
The current price of the item is given directly in the function as \( p(0) = 1200(1.039)^0 = 1200(1) = 1200 \) dollars. To find the price 8 years from today, we plug in \( t = 8 \) into the function: \[ p(8) = 1200(1.039)^8 \] Calculating \( (1.039)^8 \) gives approximately \( 1.348850 \), so: \[ p(8) \approx 1200 \times 1.348850 \approx 1618.62 \] Rounding to the nearest dollar, we have \( p(8) \approx 1619 \) dollars. Therefore, the current price is \( 1200 \) dollars, and the price 8 years from today is \( 1619 \) dollars.