$\backslash$table$[[$Firm$,$Industry A$,$Industry B$,$Industry C$,$Industry D$],[1,13,250,8,750,1,750,15,000],[2,10,975,7,500,1,725,14,000],[3,8,175,6,400,1,700,13,000],[4,4,275,5,000,1,675,12,000],[5,1,250,4,250,1,650,11,000],[6,875,4,000,1,625,10,000],[$Total$,45,350,70,900,30,125,120,000]]$

$1.$Refer to the table shown above. What is the concentration ratio for Industry A$?$

$2.$ Refer to the table shown above. What is the concentration ratio for Industry B$?$

$3.$ Suppose the market for good X has a concentration ratio of $0\mathrm{.}80.$ You know the sales for the four largest firms in the industry are, $$100,000,$$$125,000,$$$150,000,$ and $$175,000.$ Based on this information, what are sales for the remaining firms in the industry?