Nationwide Bank has approached Hometown Bank with a proposal to merge. The following table lists the sales of the banks in the area. Bank Name MegaBank City Bank Nationwide Bank Atlantic Savings Bulk Bank Metropolitan Bank American Bank Hometown Bank Urban Bank Sales (in millions) $1,100 950 845 785 665 480 310 260 140 L L Use the above information to calculate the four-firm concentration ratio and the Herfindahl-Hirschman index in the current market. Instruction: Enter your responses rounded to two decimal places. Four-firm concentration ratio: Herfindahl-Hirschman index: Based on the FTC and DOJ Horizontal Merger Guidelines described in the text, do you think the Justice Department is likely to challenge the proposed merger? It definitely will not be challenged. It may be challenged, but other factors will be considered. It definitely will be challenged