B. $300-$200=$100, you drew the correct lines on the graph, good job
C. draw the same kind of line at x=8, profit=$400-$250=$150 (I am just getting an approximate answer from what I see from the graph, you need to draw the lines)
D. look at the intersection point (where the two blue lines intersect), you will get the answer approx. 2 pairs.
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