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If [tex]f(4)=246.4[/tex] when [tex]r=0.04[/tex] for the function [tex]f(t)=P e^{rt}[/tex], then what is the approximate value of [tex]P[/tex]?

A. 289
B. 1220
C. 50
D. 210

Answer :

We are given the function

[tex]$$
f(t) = P e^{rt}
$$[/tex]

with the values [tex]$f(4) = 246.4$[/tex] and [tex]$r = 0.04$[/tex]. We want to solve for [tex]$P$[/tex].

Step 1: Substitute the given values into the function at [tex]$t = 4$[/tex].

[tex]$$
246.4 = P e^{0.04 \times 4}
$$[/tex]

Step 2: Simplify the exponent.

[tex]$$
0.04 \times 4 = 0.16
$$[/tex]

Thus, the equation becomes

[tex]$$
246.4 = P e^{0.16}
$$[/tex]

Step 3: Solve for [tex]$P$[/tex] by dividing both sides by [tex]$e^{0.16}$[/tex].

[tex]$$
P = \frac{246.4}{e^{0.16}}
$$[/tex]

Step 4: Evaluate [tex]$e^{0.16}$[/tex]. It is known that

[tex]$$
e^{0.16} \approx 1.17351
$$[/tex]

Step 5: Finally, divide to determine [tex]$P$[/tex].

[tex]$$
P \approx \frac{246.4}{1.17351} \approx 210
$$[/tex]

Thus, the approximate value of [tex]$P$[/tex] is [tex]$\boxed{210}$[/tex], which corresponds to option D.

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