Wings Diner has a box lunch that it sells on football game days at the local university. Each box lunch sells for $6, which includes $2.50 variable costs and $2.50 fixed costs, plus a $1 markup. In...

Wings Diner has a box lunch that it sells on football game days at the local university. Each box lunch sells for $6, which includes $2.50 variable costs and $2.50 fixed costs, plus a $1 markup. In the short run, what is the minimum price Wings Diner should charge (i.e., what is the price below which the diner would not normally sell a meal)?