Cust co receives cash for year-long membership througout the year and accounts for membership fee revenue on a deffered basis, retably over the one year membership. Custs liability for deffered membership fees had balances of $16000 on January 1 2021 and $18,000 on December 31, 2021. Cust reported membership fees revenue of $30000 for 2021. How cash did cust receive during 2021 for membership fees?