If the retail price of a shirt is R dollars, and the price including sales tax is T dollars then the sales tax, as a percent, is
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A$$R(T-R)\over{100}$$
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B$${T-R}\over{100T}$$
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C$${100T-R}\over{T}$$
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D$${T-100R}\over{T}$$
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E$$100(T-R)\over{R}$$
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正确答案: E