What fraction of a foot 3 inches

If x = 12 and y = 3, what is the value of x - y 2? 81 6 3 18

Adepartment store purchases screen-printed t-shirts at a cost of $5 per shirt. they mark up the price 150% (making the selling price 250% of the store's purchase price) and put them on the sales floor. every month that a t-shirt doesn't sell, the store reduces the selling price by 25%.

Anyone know? will mark brainliest if correct!