Selling cards in Lin Yuan Gym can earn about 7,000 yuan a month. According to the relevant data, the basic salary of card cancellation in Lin Yuan Gym is 6,000 yuan, and if the monthly performance is below 10000 yuan, 300 yuan can get 3% commission, and if the monthly performance is above 10000 yuan but below 20,000 yuan, 400 yuan can get 4%.