Total revenue is in dollars and x is the number of units. Suppose that the total revenue function for a commodity is 
Find the marginal revenue at 
and tell what it predicts about the sale of the next
unit. Round your answer to two decimal places.
?
A. 13.80. The selling of the next unit increases revenue by $13.80.
B. 12.60. The selling of the next unit increases revenue by $12.60.
C. -414.00. The selling of the next unit decreases revenue by $414.
D. -30.00. The selling of the next unit decreases revenue by $30.
E. -15.00. The selling of the next unit decreases revenue by $15.
Answer: B
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