Q: Of the 500 business people surveyed, 78 percent said that they use their
laptop computer in hotels, and 52 percent said that they use them both at home
and in hotels. How many of the business people surveyed said that they do not
use their laptop computers either at home or in the hotels?
A. 45 B. 55 C. 65 D.95 E. 130
Ans: A
要怎麼求出the percentage of people use laptop at home?
或者不需要知道也算得出答案嗎?
謝謝!
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