Taki and Connor invest $20 in drink mix, sugar, and paper cups for a lemonade stand. after 5 hours they have made $50 in profits. assume that they sell the drinks at the same rate all day. write an equation for their profit for the day from the lemonade stand. if their stand continues to sell from 1:00 P.M. to 8:00 p.m. that day, what is their profit for the day?