# To find the number of books that must be produced to bring the average cost of a sealable book under \$20.

Amari Flowers 2021-02-26 Answered
To find the number of books that must be produced to bring the average cost of a sealable book under $\mathrm{}20$.
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Gennenzip
Calculation:
Substituting the value of $f\left(x\right)=\mathrm{}20$ in the obtained function.
$f\left(x\right)=\frac{10x+200,000}{x-2500}$
$20=\frac{10x+200,000}{x-2500}$
$20\left(x-2500\right)=10x+200,000$
$20x-50,000=10x+200,000$
$20x-10x=200,000+50,000$
$10x=250,000$
$x=\frac{250,000}{10}$
$x=25,000$
The number of books should be produced = 25,000.