Answer
Please see the graph.
Work Step by Step
The firm chooses a level of output so that the average total costs are minimized. The price is the same as the marginal revenue.
When the average total cost is minimized, the quantity produced is $Q_{0}$, and the price is $P_{0}$. The cost of each unit is $C_{0}$, which is where the average total cost is minimized.
Total revenue is $P_{0}*Q_{0}$.
