$($b$)$ Now assume that you would need to have the same number of cooks present for the entire $8-$hour day. Obviously, this number of cooks must be an integer, and it affects capacity. Under this restriction, what is the minimum average demand volume per hour that you would need to at least break even?

$($c$)$ Using the model from part $($a$),$ where we can treat the wages of the cooks as a variable cost, at a flow rate of $20$ pizzas per hour, what percentage change in profit would you expect from: A one percent change in flow