"Find the Herfindahl index for an industry composed of ( a) three firms- one with 70 percent of the market, and the other two with 20 and 10 percent of the market, respectively; (b) one firm with a 50 percent share of the market and 10 other equal-sized firms; (c) 10 equal- sized firms.
NOTE: Use 70 instead of 70% in your Herfindahl index calculation