Answer
$C=-800p+3,320,000$
Work Step by Step
As a function of q, cost is
$C=120,000+80,000q$
To express C as a function of p, substitute $q=-0.01p+40$
$C=120,000+80,000(-0.01p+40)$
$C=120,000-800p+3,200,000$.
$C=-800p+3,320,000$
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