XYZ widget industry is comprised of six firms of varying sizes. Firm 1 has 35 percent of the market, Firm 2 has 25 percent, and the remaining firms have 10 percent each. What is the Herfindahl-Hirschman index for the widget industry? Based on the U.S. Department of Justice merger guidelines, do you think the Justice Department would be likely to block a merger between Firms 5 and 6? Why, or why not? please explain