The comparative Statement of Financial Position of Effing Company for December 31, 2019 and 2020, reported the following selected amounts: 2019 2020 office supplies on hand S 2,300 $ 1,600 Unearned rent revenue 11,500 11,000 The 2020 Income statement reported the following: Rent revenue Office supplies expense $19,000 16,600 Required: Calculate A The total amount of office supplies purchased during 2020 B. The total amount of rent collected during 2020