I got 86%, but I have to take issue with one of their answers, so I therefore annoint myself with 2% more. They showed a weight being lifted directly with a cable, and then with the cable run through a single pulley at various angles and asked which would require the least force to lift the weight. Their answer was D, all would require the same force, but I say the pulley is going to induce some amount of frictional resistance, however slight, so the correct answer is the one with no pulley involved. I'm calling my prostitute lawyer.