I would love to understand how to solve this problem: Marcia needs to add 3 skirts, 2 pairs of pants and 5 blouses to her work wardrobe.  A department store is offering a sale on pants; buy 1 pair get 1 pair 1/2 off.  If her skirts are $20.00 each, the blouses are $15.00 and both pairs of pants are $30.00 each.  How much will she spend on her wardrobe?
Can you explain?