Jefferson stops by a fast-food restaurant for a $3.50 cheeseburger every day. If he only ate at home and eliminated this cost, how much could he save after 10 weeks?
He spends $3.50 on a cheeseburger every day, so he spends 3.5*7 = $<<3.5*7=24.50>>24.50 on cheeseburgers each week.
Thus, he could save 10*24.50 = $<<10*24.5=245>>245 after 10 weeks. Answer: \boxed{245}.