Kauffman Market has a gross profit percentage of $30\%.$ It is expecting an additional $$4,000$ in revenues over the upcoming $3-$day holiday weekend. The manager would like $3$ additional staff members assisting customers during this busy time. The additional staff members will each work one $6-$hour shift per day and earn $$13$ per hour. Would it be profitable for Kauffman Market to add the extra staff members? By how much?