Show that [f(x, y) =(x^2 - y)/(x-y)] doesn't have a limit when (x, y) -> (0,0)​

Pyotr tchaikovsky sporting goods operates on a 45% overhead based on the selling price, which results in an overhead of $65.34 on the newest version of an air hockey game set. if the air hockey game set costs pyotr tchaikovsky sports $49.32, find the selling price, the markup, and the net profit.