taxes. First, use the black point (plus symbol) to indicate the equilibrium price and quantity of mountain bikes in the absence of a tax. Then use the green point (triangle symbol) to shade the area representing total consumer surplus (CS) at the equilibrium price. Next, use the purple point (diamond symbol) to shade the area representing total producer surplus (PS) at the equilibrium price. PRICE (Dollars per bike) 135 Demand 120 50 25 30 15 + B Supply Before Tax D 10 20 20 100 Equilibrium A Consumer Surplus Producer Surplus ?