The table below shows the total revenue schedule of a firm. Use the information to answer the question that follows
| 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?
No explanation has been provided for this answer.