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Answer :
To solve this problem, we need to find the initial value [tex]\( P \)[/tex] given the function [tex]\( f(t) = P e^{rt} \)[/tex]. We're told that [tex]\( f(5) = 288.9 \)[/tex] when [tex]\( r = 0.05 \)[/tex]. Let's determine [tex]\( P \)[/tex] step-by-step:
1. Understand the function and what is given:
The function is [tex]\( f(t) = P e^{rt} \)[/tex].
2. Substitute the known values into the function:
We're given that [tex]\( f(5) = 288.9 \)[/tex], [tex]\( r = 0.05 \)[/tex], and [tex]\( t = 5 \)[/tex]. So we set up the equation:
[tex]\[
288.9 = P e^{0.05 \times 5}
\][/tex]
3. Simplify the exponent:
Calculate the exponent:
[tex]\[
0.05 \times 5 = 0.25
\][/tex]
Therefore, the equation becomes:
[tex]\[
288.9 = P e^{0.25}
\][/tex]
4. Solve for [tex]\( P \)[/tex]:
We need to find [tex]\( e^{0.25} \)[/tex]. This value is approximately [tex]\( 1.284 \)[/tex].
5. Calculate [tex]\( P \)[/tex] by isolating it:
Divide both sides of the equation by [tex]\( e^{0.25} \)[/tex]:
[tex]\[
P = \frac{288.9}{e^{0.25}}
\][/tex]
[tex]\[
P \approx \frac{288.9}{1.284} \approx 225
\][/tex]
Thus, the approximate value of [tex]\( P \)[/tex] is 225, which corresponds to option A.
1. Understand the function and what is given:
The function is [tex]\( f(t) = P e^{rt} \)[/tex].
2. Substitute the known values into the function:
We're given that [tex]\( f(5) = 288.9 \)[/tex], [tex]\( r = 0.05 \)[/tex], and [tex]\( t = 5 \)[/tex]. So we set up the equation:
[tex]\[
288.9 = P e^{0.05 \times 5}
\][/tex]
3. Simplify the exponent:
Calculate the exponent:
[tex]\[
0.05 \times 5 = 0.25
\][/tex]
Therefore, the equation becomes:
[tex]\[
288.9 = P e^{0.25}
\][/tex]
4. Solve for [tex]\( P \)[/tex]:
We need to find [tex]\( e^{0.25} \)[/tex]. This value is approximately [tex]\( 1.284 \)[/tex].
5. Calculate [tex]\( P \)[/tex] by isolating it:
Divide both sides of the equation by [tex]\( e^{0.25} \)[/tex]:
[tex]\[
P = \frac{288.9}{e^{0.25}}
\][/tex]
[tex]\[
P \approx \frac{288.9}{1.284} \approx 225
\][/tex]
Thus, the approximate value of [tex]\( P \)[/tex] is 225, which corresponds to option A.
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