4. (15 points total) Toy Market is selling masks for Halloween. A mask costs Toy Market $7.00 to purchase from their supplier and sells for $10.00 retail. After Halloween is over, Toy Market can return any unsold masks to its supplier at a salvage value of $3.00 per mask. Toy Market has forecast the demand distribution of masks for Halloween as follows. COGS=7Retail=10SV=3 a. (7 points) Assuming that Toy Market would like to maximize their average profit, what is the optimal number of masks for Toy Market to purchase? * create chart of