If candy bars that regularly sell for $0.40 each are on sale at two for $0.75, what is the percent reduction in the price of two such candy bars purchased at the sale price?
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A$${2}\frac{1}{2}\%$$
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B$${6}\frac{1}{4}\%$$
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C$${6}\frac{2}{3}\%$$
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D8%
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E$${12}\frac{1}{2}\%$$