A department store is having a sale. The advertising for the sale is shown below: "30% off if the marked prices total more than $100. If you buy three items, you get the least expensive free." a. What are at least two pieces of info needed to solve a problem about buying items and saving the most money? b. What makes this advertisement confusing to a buyer? c. Suppose you buy 3 items at marked prices of $40, $40, and $30. Which sale (30% off more than $100 OR free item) would you save the most money with?