a. On October 1, a business collected $6,300 rent in advance, debiting Cash and crediting Unearned Revenue. The tenant was paying one year's rent in advance. On December 31, the business must account for the amount of rent it has earned. b. Salaries expense is $1,100 per day-Monday through Friday-and the business pays employees each Friday. This year December 31 falls on a Thursday. c. The unadjusted balance of the Office Supplies account is $2,700. Office supplies on hand total $1,600. d. Equipment depreciation was $200. e. On July 1, when the business prepaid $1,200 for a two-year insurance policy, the business debited Prepaid Insurance and credited Cash.