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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
  • A$$R(T-R)\over{100}$$
  • B$${T-R}\over{100T}$$
  • C$${100T-R}\over{T}$$
  • D$${T-100R}\over{T}$$
  • E$$100(T-R)\over{R}$$
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正确答案: E

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