Hi Phi Sound Unlimited has a monopoly over the installation of surround sound systems. If Hi Phi Unlimited's total revenue from installing 15 sound systems is $30,000 and its total revenue from installing 18 sound systems is $33,000, what is the marginal revenue of the eighteenth sound system?
A. -$3,000
B. $1,000
C. $1,500
D. $3,000
Answer: B
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