This link (http://www.collegeboard.com/student/testing/ap/economics_micro/samp.html?micro has a list of released Microeconomics AP free-response questions. I have a question concerning the 2011 primary released exam. See the questions here http://apcentral.collegeboard.com/apc/public/repository/ap11_frq_microeconomics.pdf and the solutions here http://apcentral.collegeboard.com/apc/public/repository/ap11_microecon_scoring_guidelines.pdf. Notice Question 1 Part (f): The marginal revenue of the eighth unit is apparently $22. However, to me it appears to be $12, as per the MR slope. Can anyone explain? Also, Question 3 Part (a): Notice the two triangles created by the MSC curve; I would have thought that the DWL (Dead Weight Loss) was the bottom triangle, since the top triangle was never used. Any thoughts?