Suppose the Market Demand for Milk Is Q^d = 150

Suppose the market demand for milk is Q^d = 150 - 5P.Additionally,suppose that a dairy's variable costs are VC = 2Q² (where Q is the number of gallons of milk produced each day) ,its marginal cost is MC = 4Q and there is an avoidable fixed cost of $50 per day.In the long run there is free entry into the market.Suppose the demand for milk doubles.What is the new long-run equilibrium price?

A) $20 per unit
B) $40 per unit
C) $24 per unit
D) $2 per unit