Economics An industry consists of three firms with sales of $25, $45, and $55. a. Calculate the Herfindahl-Hirschman index (HHI). Instruction: Enter your response rounded to the nearest integer. b. Calculate the four-firm concentration ratio (C4). c. Based on the FTC and DOJ Horizontal Merger Guidelines described in the text, is the Department of Justice likely to attempt to block a horizontal merger between two firms with sales of $25 and $45?    Plz solutions part B and C

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