A T-shirt takes ten minutes to make and a sweatshirt takes 20 minutes to make. You have at most 20 hours to make shirts. The supplies for a
T-shirt cost $4 and the supplies for a sweatshirt cost $20. You want to
spend no more then $600 on supplies. You want to have at least 50
items to sell. How many T-shirts and how many sweatshirts should you
make to maximize your profit? The profit per T-shirt is $6 and the profit
per sweatshirt is $20,