Paul is going to have the exterior of his home painted. painting usa charges $75.00 to come out and evaluate the house plus $25.00 per hour of labor. upscale home painting does not charge to evaluate the house. however, they charge $40.00 per hour. if it takes 25 hours to paint paul’s house, the most cost effective company will be, if it takes 25 hours to paint paul’s house, the most cost effective company will be

Here is their argument. given the obtuse angle x, we make a quadrilateral abcd with ∠dab = x, and ∠abc = 90◦, and ad = bc. say the perpendicular bisector to dc meets the perpendicular bisector to ab at p. then pa = pb and pc = pd. so the triangles pad and pbc have equal sides and are congruent. thus ∠pad = ∠pbc. but pab is isosceles, hence ∠pab = ∠pba. subtracting, gives x = ∠pad−∠pab = ∠pbc −∠pba = 90◦. this is a preposterous conclusion – just where is the mistake in the "proof" and why does the argument break down there?

Which one ? is the answer and how to find this answer

Find the commission on a $590.00 sale if the commission is 15%.