what is the concentration ratio for the industry x and y.
(number of firm) ----(industry x) ------ (industry y)
(1) -----------------------8,750-------- --------1,750
(2) -----------------------7,500---------------- 1,725
(3)------------------------6,400---------------- 1,700
(4)------------------------5,000---------------- 1,675
(5)------------------------4,250 ----------------1,650
(6)------------------------4,000 ----------------- 1,625