PP DS1 Q50

[johnqrock]

50. 4230-!-item-!-187;#058&003784
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.


為什麼答案是C呢?
我怎麼看都像是E

Please HELP !!!
Thank you.

[Weichieh]

已知：TC=L+M
問：500000-TC>150000 ?

1)
TC=3M
500000-3M=?（不知道M，不能判斷）

2)
500000-TC>L（不知道M,L，不能判斷）

3)
500000-3M>2M (L=TC-M =3M-M=2M)
M<100000
TC=3M<300000

500000-TC>200000>150000 （成立）

[sleeplessboy[origen]]

之前有討論過的, 可以參考看看

viewtopic.php?f=10&t=28729&p=196948&hilit=pp+50#p196948