Teresa purchases a shirt that is listed for $60 and is 40% off. At the register she uses a coupon that takes an additional 15% off the sale price. How much does Teresa pay for the shirt?

If the angle bisectors of a pair of opposite angles of a quadrilateral are the opposite sides of a parallelogram formed by the two angle bisectors and two sides of the quadrilateral, is the quadrilateral always a parallelogram? explain your answer.