单选题
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、
(E) 1.0%
【正确答案】
E
【答案解析】
[解析] 考生一定要注意的是题目最后问的是一个Y牌电视的价格，设X牌电视的单台价格为x，则Y牌电视的单台价格为2x，所有这些电视的总价格为40x+80×2x=200x，根据题意可得单台Y牌电视占总帐单的百分比为：
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