Rachel wants to use her knitting skills to make a little extra money so she can enjoy a theatre weekend with her besties. She's got pattern down for a hat, scarf, and mittens, but she realizes that her available time is limited. She should be able to sell as many of a item as she can make (they all sell for $15 ), but she only has 20 hours available between now and her theatre outing. See below for and time information. Using Excel Solver, calculate how many of each item Rachel should make in order to maximize her contribution margin given her ti constraint. (If no unit of an item is to be produced enter 0 . Do not leave any field blank.)