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题库 / Prep2007E1-DS-50
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 its cost for materials.
(2) The company's profit was greater than its cost for labor.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
还没有题目讲解（毕出老师会陆续发布对官方考题的解读，请保持关注）。
R=500,000; C=L+M; P=R-C
(1) C=L+M=3M
(2)P>L
(1)(2)单独无解
如(1)(2)同时成立，则可得：
P=500,000-3M>L=2M 即M150,000
条件一可以得出所有成本＝３＊材料费，另根据题目，所有成本＝劳动力成本＋材料费，那么可以推出劳动力成本＝２＊材料费；
条件二可以得出利润＞劳动力成本，那么利润=500000-所有成本=500000-劳动力成本-材料费〉劳动力成本，结合条件一所得的劳动力成本=2*材料费。可以推出5*材料费〈500000，那么材料费〈100000，所有成本〈300000，可以得出利润肯定大于150000，可以肯定回答问题。
看着C选了B我真牛逼
was paid是被付款，不是说cost!!!是收入
请问大家这个记分是准的吗？
检查 l＝2／3c
Given: c=l+mc=l+m
Question is p=500−c>150p=500−c>150 true?
(1) c=3mc=3m --> is 500−3m>150500−3m>150 true? --> is ml --> 500>2l+m500>2l+m. Not sufficient.
(1)+(2) Question became is m2l+m=4m+m=5m500>2l+m=4m+m=5m --> m
设materials cost=x.
条件1:labor cost=3x. total cost=4x. profit=500-4x
条件2:500-4x>3x, 得x200
列出不等式
mark，列不等式解
500k-(m+l)>150k?
1)+2)联立，m