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Joe Mack , a district manager for Cormack Enterprises Inc. , a Burger King operator in Omaha , Neb. , says discounting is so prevalent that `` we have to serve 15 % to 20 % more customers '' to keep sales level .
 Joe Mack, Cormack Enterprises Inc., Burger King, Omaha, Neb., 15 % to 20 %
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
Answer:
 Joe Mack, Cormack Enterprises Inc., Burger King, Omaha, Neb., 15 % to 20 %