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单项选择题
A total of 40 brand X television sets and 80 brand Y television sets were purchased for a motel chain. If the price of each brand Y set was twice the price of each brand X set, what percent of the total bill was the price of a brand Y set ？（）
A．0.25%
B．0.5%
C．0.625%
D．0.833%
E．1.0%
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