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题目材料：
A manufacturer bought 500 pounds of compound $$C$$ in 1997 and, through a process costing a total of $50, produced from it 450 pounds of compound $$B$$, which was then sold in 1998. lf the compounds were bought and sold at the rates shown in the table and if the only costs to the manufacturer were the cost of the compound $$C$$ and the processing, what was the manufacturer' s total profit from this transaction?
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A.$35
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B.$40
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C.$45
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D.$50
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E.$55
C显示答案
