plz give me answer according to a final exam paper. thanks

Q.No.4: Consider total cost and total revenue given in the following table: Quantity Total cost 10 Total Revenue 1. Calculate profit for each quantity. How much should the firm produce to maximize profit? II. Calculate marginal revenue and marginal cost for each quantity. Graph them. (Hint: Put the points between whole numbers. For example, the marginal cost between 2 and 3 should be graphed at 2.5) At what quantity do these curves cross? How does this relate to your answer to part (a)? III. Can you tell whether this firm is in a competitive industry? If so, can you tell whether the industry is in a long-run equilibrium