The table shows the total revenue of the 50 firms in the plastics recycling industry. Calculate the four-firm concentration ratio and the HHI. Total revenue Firm (dollars) > >> Answer to 2 decimal places. Green Man 450 Good Earth 325 A Plus Recycling 250 Enviro Tech 200 Next 16 firms (each) 50 The four-firm concentration ratio equals Next 30 firms (each) 20 Industry 2,625 The HHI equals. The four-firm concentration ratio indicates that the market is and the Herfindahl-Hirschman Index indicates that the market is (Assume there are no reasons that would make the concentration measures unreliable guides.) O A. a monopoly; monopolistic competition O B. a monopoly; a monopoly O C. monopolistic competition; a monopoly O D. monopolistic competition; monopolistic competition O E. probably not monopolistic competition; monopolistic competition