Journalize the following transactions:

(1) Based on prior experience, GBI estimates that approximately 0.5% of the net credit sales (gross credit sales minus returns of credit sales) for the month will become bad debt. GBI writes off bad debts as they occur and recognizes bad debt expense based on anticipated bad debts as an adjusting entry each month.(2) As a control measure, physical inventories are taken on a periodic basis alternating between the raw materials inventory, finished goods inventory and trading goods inventory. Physical inventory of the trading goods inventory was taken at the end of January. It was determined that the value of the trading goods merchandise on hand was $42,150.(3) GBI counted the office supplies on hand after the close of business on the last day of the month and determined the cost of the unused office supplies to be $490.(4) Production Machinery, Equipment and Fixtures were placed in service on January 1, 2012, are expected to last 15 years with no savage value. The bar-code system has a 5 year life and no salvage value. GBl depreciates fixed assets on a straight-line basis and those assets acquired in the first half of the month are depreciated for the entire month while fixed assets placed in service during the last half of the month are not depreciated until the following month. Depreciation is rounded to the nearest dollar and assets are depreciated on a monthly basis (i. e number of days in the month is not of consequence)