Answer:
b. $500.
Explanation:
The marginal revenue of labour is equal to change in total revenue divided by change in workers.
Revenue = price × output
=$10 × 550 = $5500
=$10 × 500 = $5000
Change in revenue = $5500 - $5000 = $500
Change in workers = 101 - 101 = 1
Marginal revenue = $500 /1 = $500