Answer:
perfect competitor
Step-by-step explanation:
Given:
Firm's total revenue when 10 units are sold = $100
Firm's total revenue when 11 units are sold = $110
Average Revenue =

or
Average Revenue =
= $10
and,
the marginal revenue = $110 - $100 = $10
Since,
the average revenue and the marginal revenue for the firm is equal,
therefore, the is a perfect competitor