Hi Phi Sound Unlimited has a monopoly over the installation of surround sound systems. If Hi Phi Unlimited?s total revenue from installing 20 sound systems is $30,000 and its total revenue from installing 21 sound systems is $30,800, what is the marginal revenue of the twenty-first sound system?

A. -$1,500
B. -$700
C. $800
D. $1,467


Answer: C

Economics

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