Journalize the adjusting entry needed at December 31 for each of the following independent situations. 

a. On October 1, we collected \(\$ 4,000\) rent in advance, debiting Cash and crediting Unearned Rent Revenue. The tenant was paying one year's rent in advance. At December 31, we must account for the amount of rent we've earned.

b. Salary expense is \(\$ 1,500\) per day-Monday through Friday-and the business pays employees each Friday. This year December 31 falls on a Tuesday.

c. The unadjusted balance of the Supplies account is \(\$ 3,100\). Supplies on hand total \(\$ 1,200\).

d. Equipment was purchased last year at a cost of \(\$ 10,000\). The equipment's useful life is four years. Record the year's depreciation.

e. On September 1 , when we prepaid \(\$ 1,200\) for a two-year insurance policy, we debited Prepaid Insurance and credited Cash.