A graph of price versus quantity shows two parallel demand curves and two parallel supply curves. From left to right they are D and D prime, and S prime and S. Curve S is a straight line ascending from the origin through points (50, 100) and (75, 150). Curve S prime is a straight line ascending from (0, 100) through points (25, 150), and (50, 200). Curve D is a straight line descending from (0, 200), to (100, 0). Curve D prime is a straight line descending from (0, 300) to (150, 0). Curve D prime intersects Curve S prime at point. (50, 200). Curve D prime intersects Curve S at point (75, 150). Curve S intersects Curve D at point (50, 100). Curve D intersects Curve S prime at point (25, 150). Refer to Figure 7-5. If the supply curve is S, the demand curve is D, and the equilibrium price is $100, what is the producer surplus? $625 $1,250 $2,500 $5,000