In a bakery for a given amount of croissant production, an additional pastry worker produces 100 additional croissants, and one extra mixing machine produces 50 extra croissants. Each pastry worker costs $30 to hire, and a mixing machine costs $10 per unit. The bakery owner should
A. produce fewer croissants.
B. hire an additional pastry worker.
C. purchase an additional mixing machine and use one less pastry worker.
D. hire an additional pastry worker and sell a mixing machine.
Answer: C
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