From the graph analyzed in the question, the price will be $100 per unit while the quantity demanded will be 10 units.
From the complete question, the marginal revenue of the fourth unit that is produced will be:
= (160 × $4) - (170 × $3)
= $640 - $510
= $130
The marginal revenue of the eighth unit will be:
= (120 × 8) - (130 × 7)
= 960 - 910.
= $50
Therefore, the marginal revenue of the eighth unit is $50.
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