Required Information The following table shows Erica's utility for muffins and grapefruit. Grapefruit Marginal Quantity Muffins Marginal Utility Utility 80 75 70 72 60 66 50 62 40 56 Refer to the above Information to answer this question. If Erica has a budget of $5 and the price of a muffin Is $2 and a grapefruit Is $1, what will be her optimal purchase