College

If [tex]$f(3)=191.5$[/tex] when [tex]$r=0.03$[/tex] for the function [tex]$r(l)=P e^t$[/tex], then what is the approximate value of [tex]$P$[/tex]?

A. 471
B. 210
C. 175
D. 78

Answer :

To find the approximate value of [tex]\( P \)[/tex], we start from the given function:

[tex]\[ f(t) = P \cdot e^{r \cdot t} \][/tex]

We're informed that [tex]\( f(3) = 191.5 \)[/tex] when [tex]\( r = 0.03 \)[/tex]. Let's set up the equation:

[tex]\[ 191.5 = P \cdot e^{0.03 \cdot 3} \][/tex]

Calculate the exponent:

[tex]\[ e^{0.03 \cdot 3} = e^{0.09} \][/tex]

To find [tex]\( P \)[/tex], rearrange the equation:

[tex]\[ P = \frac{191.5}{e^{0.09}} \][/tex]

Substitute the value of [tex]\( e^{0.09} \)[/tex]:

- Calculating [tex]\( e^{0.09} \)[/tex], you get approximately 1.09417.

Now, compute [tex]\( P \)[/tex]:

[tex]\[ P = \frac{191.5}{1.09417} \][/tex]
[tex]\[ P \approx 175.0178 \][/tex]

The approximate value of [tex]\( P \)[/tex] is about 175. Among the given choices:

- A. 471
- B. 210
- C. 175
- D. 78

The closest to the calculated value is:

C. 175

Therefore, the approximate value of [tex]\( P \)[/tex] is 175.