Stores x, y, and z each sell a certain item that has a given list price. stores x and y are located in a state with a 5 percent sales tax, and both sell the item at a 5 percent discount off list price, while store z is located in a state with no sales tax and gives no discounts. store x applies its discount first and then charges tax on the discounted price, while store y adds the tax first and then applies the discount to the price with tax. if x and y are the prices, with tax and discount, charged by stores x and y, respectively, and z is the price charged by store z, which of the following statements correctly describes the relationship among x, y, and z ? a. x=y=zb. x=y