An Industry coralsts of six firms with sales of $500 million $1 billion, $2 billion, 53 billion, 54 billion and $5 billion al Calculate the Herfindahl-Hirschman Index b) Calculate the four-firm concentration ratio (C4) Based on the US Department of Justicer's Merper Guidelines, do you think the Department of Justice would block a horizontal merger between the two forms with sales of 5500 milion and $1 billion? Explain and support your explanation with calculations Clearly label each answer and show all calculations that you do, or you will receive no credit for your answers)