Required: Wings Diner has a box lunch that it sells on football game days at the local university. Each box lunch sells for $13, which includes $3.50 variable costs and $3.50 fixed costs, plus a $6 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)? (Round your answer to 2 decimal places.) Wings will make a profit by selling at any price above cost of per meal