The taxpayer had incorrectly been using the cash method of accounting. For 2019, the company voluntarily changed to the accrual method. The adjustment due to the change in method as calculated at the beginning of 2019 was $120,000 (positive). The adjustment as calculated as of the end of 2019 was $80,000 (positive). As a result of the change in method, the company must:

Required prepare the necessary adjusting entries in the general journal as of december 31, assuming the following: on september 1, the company entered into a prepaid equipment maintenance contract. birch company paid $3,400 to cover maintenance service for six months, beginning september 1. the payment was debited to prepaid maintenance. supplies on hand at december 31 are $3,900. unearned commission fees at december 31 are $7,000. commission fees earned but not yet billed at december 31 are $3,500. (note: debit fees receivable.) birch company's lease calls for rent of $1,600 per month payable on the first of each month, plus an annual amount equal to 1% of annual commissions earned. this additional rent is payable on january 10 of the following year. (note: be sure to use the adjusted amount of commissions earned in computing the additional rent.)