Consider an industry with 30 firms. The 7 largest firms and their market shares are listed in the table below: Firms and Market Shares Firm Market Share Ardor 30% Boom 21% Canary 18% Dream 11% Excel 5% Flight 4% Grande 2% The other 23 firms own the rest of the market. The four-firm concentration ratio in this industry is ____%. Do not include the percent sign (%) in your