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I have revised the question, solution, and formatting by adding more details to enhance clarity.
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The # labels on the y axis for Cost per Bushel (corn) are very skewed, so I miscalculated the numbers. Are they supposed to be in that exact spot? Or are they also skewed? If they are supposed to be like that, in the GMAT when I see a problem where the numbers look off, should I go based off of the gap in the numbers, or the horizontal lines on the graph?
Yes, the right-side labels in the original graph were poorly aligned, which made the scale unnecessarily confusing. I have revised the graph so that each corn value is clearly aligned with its corresponding tick position.

On the GMAT, always read a value using the axis assigned to that series. Here, corn must be read from the right vertical axis, while ethanol and gasoline must be read from the left vertical axis. Do not assume that a horizontal gridline represents the same numerical value on both axes.

In general, use the tick marks and their labels to determine the scale.
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