Stereo Sound Unlimited Has a Monopoly Over the Installation of Surround

Stereo Sound Unlimited has a monopoly over the installation of surround sound systems. If Stereo Sound Unlimited's total revenue from installing 10 sound systems is $20,000 and its total revenue from installing 11 sound systems is $18,000, what is the marginal revenue of the eleventh sound system?

A) -$2,000
B) -$1,000
C) $2,000
D) $3,800

Correct Answer:

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