A partial trial balance of Dickinson Ltd. is as follows on December 31, 2020. Dr. Cr. Supplies $ 2,500 Salaries and wages payable $ 1,500 Interest receivable 5,100 Prepaid insurance 40,000 Unearned rent -O- Accrued interest payable 15,000 Additional information: 1. Through oversight, the Salaries and Wages Payable account was not record accordingly during 2020. Actual amount of accrued salaries and wages on Decembe 2020, amounted to $4,400. 2. The Interest Receivable account was also left unchanged during 2020. Accrued interest on investments amounts to $4,350 on December 31, 2020. 3. Insurance for one-year period was unintentionally charged to 2020 insurance expense. The company purchased the insurance on April 1, 2020. 4. $36,000 was received on January 1, 2020, for the rent of a building for both 2020 and 2021. The entire amount was credited to rental income. 5. Depreciation for the year equipment was erroneously recorded as $36,000 rather than the correct figure of $3,600. 6. A further review of depreciation calculations of prior years i.e., 2018 and 2019) revealed that depreciation of $7.200 was not recorded. It was decided that this oversight should be corrected by a prior period adjustment. REQUIRED: Assuming that the books have not been closed, what are the correcting entries necessary at December 31, 2020? (Ignore income tax considerations.)