A Perfectly Competitive Industry Has 100 High-Cost Producers, Each with a Short-Run

Multiple Choice

A perfectly competitive industry has 100 high-cost producers, each with a short-run supply curve given by Q_H = 16P, and 100 low-cost producers, each with a short-run supply curve given by Q_L = 24P.
The industry demand curve is given by Q^d = 100,000 - 1,000P. At market equilibrium, industry producer surplus is:

A) $800,000.
B) $20,000.
C) $4,000.
D) $1.2 million.