Dan, age 15, also wants to purchase "Run Fast, Jump High" sneakers for $100. He decides to wash cars in the neighborhood during the summer. He has five steady customers who want him to wash their cars every week for the eight weeks. He charges seven dollars per car. He's decided to spend his first two weeks salary on movies, candy, and bowling with his friends. He tries to save half of his earnings for the rest of the weeks but only saves ten dollars each week. Will he have enough to buy his sneakers? Why or why not?