A faculty member sells Gatorade at UNC Charlotte football games. He finds that if he raises his selling price by $1, he sells 6 less bottles each week. He turns over the operation to a Managerial Economics student for a week. The goal is to maximize revenue since the faculty member has a vast supply of Gatorade, and any unsold bottles can be sold in future weeks. The student takes over the operation for a week. She says she sold at the revenue-maximizing price of $4 per bottle. How many units sold