The car will travel eighty miles in 1/2 hour
It could be 28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43, or 44.
If one shirt equals to $21.46, and you need to purchase 4 shirts to get the free pair of jeans, you multiply 4 by 21.46 and get 85.84. But if there is 42 customers taking advantage of the special, then you need to multiply 85.84 by 42, and you get 3,605.28.