Firm$$s short$-$run cost function is SRT C$($q$)=$ q$2+10$q$,$ sunk expenditures

are $$625$ and thus its short$-$run marginal cost is SRM C $=2$q $+10.$

$($a$)$ If p $=$ $$40,$ how much will this firm produce? What will its quasi$-$rent?

Profit?

$($b$)$ Is p $=$ $$50$ a long$-$run equilibrium price? Explain.

$($c$)$ What is the firm$$s short$-$run supply function? Graph it$.$

$($d$)$ Find the price at which this firm covers also for sunk expenditures