how can I solve this with excel solver?

Example 1: Maximizing Shirt Production & Profit A manufacturer of men's shirts determines that her costs will be 500 dollars for overhead plus 9 dollars for each shirt made. Her accountant has estimated that her selling price p should be determined by p = 30 0.21 where x is the number of shirts sold. 1) How many shirts should be produced to maximize profit? 2) At what price will the shirts be sold? 3) What is her resulting profit? imation di