已知某商品的产量为q件时总成本为c(q)=100q+q2/160(百元),则q=500件时的边际成本为()
A.10000元
B.10625元.
C.20000元
D.16025元
正确答案是B
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Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
When animals have more food, they generally( )faster. (multiple)