Please note that the letters inside the diagram below (such as G, H, M) refer to the shapes defined by the line segments (solid or dashed) surrounding the letter. P P4 G P3 S H M P2 N P1 K Po R L V D Q3 Q2 Q5 Q Question: A unit sales tax has been collected from the sellers. In the diagram, if the after-tax equilibrium quantity is Q3, the per-unit tax must be equal to O P2 - Po O P3 - P2 O P2 - P1 O P3 - P1