12. A clothing store advertises a discount on shirts. Buy two shirts, get 50% off the third shirt. Ky wants to buy three shirts, which were originally priced $42 each. The store will discount the price of the third shirt and then apply a 7% tax to the total cost of all three shirts. Including the tax, what will be the mean cost of each shirt? * Need this for a quiz. I Don´t want late credit so answer quickly