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Bunuel
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It will be B.

1) Unrelated, we don't care about alteration prices because it doesn't tell us anything about the original amount or the discount percentage.
2) Here we have the discount percentage, and that's what we are looking for.
Let's assume original price = x, so 140 = 70x/100 (70x because it's at 30% off)
so x = (140 x 100)/70, so x = 200. Sufficient.
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