A construction company was paid a total of 500,000 for a construction project. The company's only costs for the project were for labor and materials. Was the company's profit for the project greater than 150,000? (1)The company's total cost was three times is cost for material .
(2)The company's profit was greater than its cost for labor. 选C，但是Cost的总数也没给啊，怎么能判断出来呢？怎么想都不明白，求指教啊！！
The answer is C. Suppose the cost for material is x,then the total cost must be 3x. In this way, the profit can be represented as 500,000-3x. With condition(2), 500,000-3x>3x-x=2x x is less than 100,000. As a result ,the profit must be larger than 200,000
京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号
发表于 2010-5-12 12:44:27
收藏
收藏
楼主
