1. Total cost (TC)= 3 cost of materials (MC) or 1MC and 1 cost of labor (LC), which equals to 2 MC. Nothing said about profit, so insuff.
2. Nothing about MC, so insuff.
Together. Let's find MC. Costs+profit=500000
Only cost for labor and materials. Cost of Labor(LC)=2MC and profit is greater than LC or 2 MC
1MC+2MC+2MC=500000 5MC=500000 MC=100000
Profit not less than 200000. Answer is C.
第二道是什么意思呢？ G是定量？
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