An online furniture store sells chairs for $50 each and tables for $300 each. Every day, the store can ship no more than 53 pieces of furniture and must sell a minimum of $8400 worth of chairs and tables. If 27 chairs were sold, determine all possible values for the number of tables that the store must sell in order to meet the requirements. Your answer should be a comma separated list of values. If there are no possible solutions, submit an empty answer.