Total cost is $C=8600+4\mathrm{.}30q$ and total revenue is $R=5\mathrm{.}55q,$ both in dollars, where $q$ represents the quantity produced.

$($a$)$ What is fixed cost?

The fixed cost is $

$($b$)$ What is the marginal cost per item?

The marginal cost is $

$($c$)$ What is the price at which this item is sold?

The selling price is $

$($d$)$ For what production levels does this company make a profit?

The company makes a profit when production is units.