Find the surface area (including the floor) and volume of the composite figure. HELP PLZ❗️

I’m still confused on how to work the percentages

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.

Would greatly appreciate these 3 answers