WAEC Economics 2020 Question 21

Use the table below (Table 1, the total revenue schedule of a firm) to answer the question.
Output (units) | 50 | 60 | 70 | 80 | 90
Total revenue (TR) $ | 85 | 102 | 119 | 136 | 153
What is the unit price of the firm's output?

1. A.$10.00
2. B.$2.70
3. C.$2.00
4. D.$1.70