Please see full Question attached Answer and Explanation:
A. Answer A : profit is maximised at output level 2.5 units where marginal revenue(MR) equal to marginal cost(MC)
B. Answer A: Profit is maximised at price $40 where the demand curve matches marginal revenue and marginal cost .
C. Answer C : Economic profit is equal to zero .
D. Answer D. Allocative efficiency is achieved where demand is equal to marginal cost. Level of output at this point is equal price at $25
E. Answer C. Efficient level of output is achieved where average total cost is lowest. From the diagram average total cost is lowest at output level 4.5 units.