If a monopolist's marginal revenue is $15 per unit and its marginal cost is $25, then to maximize profit the firm should decrease output

If a firm in the U.S. wants to purchase 50,000 yuan worth of raw materials from a Chinese firm, how many dollars would it have to transfer to the firm? Assume that one dollar exchanges for 6 yuan in the foreign exchange market

A) $8333.33 B) $7,500 C) $6,773.21 D) $9,663.22

In the above figure, what is the marginal social cost to the economy of producing the four-hundredth pretzel?

A) $0 B) $2.00 C) $4.00 D) None of the above answers are correct.