The market for sugary soft drinks in Champaign-Urbana is characterized by the following linear Demand and Supply equations: Demand: Qd = 100,000 - 10,000P Supply: Qs = 30,000P - 20,000 where the price, P, is expressed in cents/ounce and the quantity, Q, in thousands of ounces. The city government introduces an excise tax of 10 cents per ounce of sugary drinks. Which of the following represents the effective, post-tax supply equation? Please select the best response. The market for sugary soft drinks in Champaign-Urbana is characterized by the following linear Demand and Supply equations: Demand: Qd = 100,000 - 10,000P Supply: Qs = 30,000P - 20,000 where the price, P, is expressed in cents/ounce and the quantity, Q, in thousands of ounces. The city government introduces an excise tax of 10 cents per ounce of sugary drinks. Which of the following represents the effective, post-tax supply equation? Please select the best response. Qs = 100,000 - 10,000P Qs = 30,000P 280,000 Qs = 30,000P - 320,000 Qs = 30,000P - 20,000