22.The question below is based on the following demand schedule for a monopolist:

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P ($) Q (units) TR ($) MR ($)

(1) (2) (3) = (1)(2) (4)

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160 1

150 2

140 3

130 4

120 5

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Where: P is Price; Q is Quantity; TR is Total Revenue; MR is Marginal Revenue.

The marginal revenue associated with the sale of the third unit is:

Group of answer choices

a. $390.

b. $130

c. $140.

d. $120.

e. $110.