\( C(x) = 0,02181 x^{3}-4,5389 x^{2}+271 x+4200 \\ \overline{ v(x) }=\frac{c(x)}{x}=0,02181 x^{2}-4,5389 x+271 \\ \overline{ v(x) } = 0,04362 x-4,5389=0 \\ x \approx 104,06 \)
\( \overline{v(104,06)} = 0,02181 · 104,06^2 - 4,5389·104,06 + 271 \\ \approx 34,85 \)