On a certain transatlantic crossing, 20 percent of a ship's passengers held round-trip tickets and also took their cars abroad the ship. If 60 percent of the passengers with round-trip tickets did not take their cars abroad the ship, what percent of the ship's passengers held round-trip tickets?
  A.33 1/3%
  B.40%
  C.50%
  D.60%
  E.66 2/3%
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5. [DS] Warehouse W's revenue from the sale of sofa was what percent greater this year than it was last year?
     1) W sold 10 percent more sofas this year than it did last year
     2) W's selling price per sofa was $30 greater this year than it was last year
Solution:
     GMAT 的 Profit = Revenue - Cost
     這題沒有 Cost 所以不考慮太多
     Revenue = Sales Number x Price
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 167.
 In a survey of 248 people, 156 are married, 70 are self-employed, and 25
 percent of those who are married are self-employed.  If a person is to be
 randomly selected from those surveyed, what is the probability that the
 person selected will be self-employed but not married?
 (A) 1/8
 (B) 4/31
 (C) 117/248
 (D) 1/4
 (E) 31/117
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