On October 1, 2019, Samer company received $24,000 cash in advance for services to be completed in the next year. On December 31, 2019, only 30% of unearned service revenues are recognized the proper adjusting entry would include a credit to Select one: unearned service revenue $16,800. service revenue $16,800. service revenue $7,200. unearned service revenue $7,200