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) 1.0%
(A) 0.25%
(B) 0.5%
(C) 0.625%
(D) 0.833%
(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：
