4. Sophia and Mae set up a lemonade stand at the RMS basketball games. Mac charged them $20 to set up the stand. Their other expenses were $4.00 for materials for sign; $1.50 for each bag of 100 cups; $1.00 for each bag of ice: and $2.50 for each package of lemonade mix, each of which made 2 gallons of lemonade. If they bought 300 cups, 12 bags of ice, and 9 packages of lemonade mix, how many 8-ounce cups of lemonade could they have sold from the amount of mix they bought? How many cups of lemonade must they have sold at $0.50 per cup to break even? How much profit did they make if all the lemonade was sold?