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A is 25%, if you divide that by C's 60% you get 42%. 42% divided by B's 50% is 84%.
84% on a standard grading scale is a B. So you divide 84% by B's 50% again and get 168%.
But we can't forget 25% for D. 168% x 25% = 42%.
So yeah, trick question. The right answer is 42 which is none of the above.
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