Wings Diner has a box lunch that it sells on football game days at the local university. Each box lunch sells for $12, which includes $4.50 variable costs and $4.50 fixed costs, plus a $3 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.)