I would love to understand how to solve this problem: Brad wanted to set up a lemonade stand to earn some money.  Every gallon of lemonade would yield 16 glasses.  He figured it would cost him $3.50 to make every gallon of lemonade.  He made 2 gallons to sell and decided he would sell each glass for $1.00  He drank 5 glasses while sitting in his stand.  He sold all but 6 glasses of lemonade.  How much net profit did Brad earn?
Can you explain?