It is customer appreciation week at Jim's Shoe Outlet, which means all customers are given a 20% discount on all items. A customer comes in with a birthday coupon for an additional 10% off any one item. The customer buys 3 pairs of shoes for $120.00 each. After the two discounts, how much does the customer pay?

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle.he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field