During 2021 , Ocean Consulting had the following transactions with its clients (customers): - On February 1, 2021, the company received cash of $6,500 from clients in payment of their account balances as of December 31,2020. - On November 1, 2021, the company received $3,500 cash as payments in advance for services to be performed in 2022. - The company received a total of $20,500 in cash for services that were performed during 2021. - The company sent bills totaling $5,500 to clients for services performed durin 2021; this amount was unpaid as December 31,2021. What is the amount of Service Revenue that will be reported on the income statement for the year 2021