Star Catering had following transactions.

Jan $1.$ Star Catering provided a catering service for Moon Corporation, and received cash $$10,000$

Jan $2.$ Star Catering had a service contract with Mary Corporation. In the contract, Mary Corporation pays cash $$20,000$ on January $2,$ and Star Catering will provide a catering service on January $31.$

Jan $3.$ Star Catering purchased an equipment $$3,000$ on account.

Jan $20.$ Star Catering paid back $$3,000$ for their equipment purchase on January $3.$

Jan $31.$ Star Catering provided the catering service for Mary Corporation.

Based on these transactions, how much is the balance of Total Liability?