I'm trying to simulate the grading of Advanced Placement multiple choice question (not multiple answer). Assuming that questions are each worth one point (and the whole quiz can be scaled from there), correct answers earn 1 point, and incorrect answers earn -0.25 points. In other words, there is a 1/4 point deduction from the total score for each incorrect answer.
I tried making all incorrect answers worth -25% and the correct answer worth 100% in the question editor, but it does not seem to be deducting the penalty.