What is the dialogue mostly about?
A. a red flag
B. new procedures
C. early payments
D. a long-time customer
What does the man think about Thomas and Nash Distributing?
A. It is a new customer.
B. It had an accounting error.
C. It is going to stiff his client.
D. It owes the client a lot of money.
假设产量为199单位时，平均成本为10元，再增加一单位产品的边际成本为50元，那么增加该单位产品以后的平均成本大约为()
A. 10.5
B. 50.4
C. 30.6
D. 10.2
已知某企业的产量为9单位时，总成本为95元，产量增加到10单位时平均成本为10元，由此可知边际成本为()
A. 5元
B. 3元
C. 10元
D. 15元
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