At a concession stand, five hot dogs and four hamburgers cost 11.00; four hot dogs and five hamburgers cost 11.50. find the cost of of one hot dog and the cost of one hamburger

Astore is having a sale in which all items are reduced by 20 percent. including tax, jennifer paid $21 for a pair of shorts. if the sales tax is 5 percent, what was the original price of the shorts