9:27 Marks Corporation has two operating departments, Drilling and Grinding, and an office. The three categories of office expenses are allocated to the two departments using different allocation bases. The following information is available for the current period: Office Expenses Salaries Depreciation Advertising Allocation Basis Number of employees Total $44,000 25,000 48,000 Net sales Cost of goods sold Item Number of employees Net sales Drilling 1,600 $ 348,000 2,400 $ 522,000 Grinding Total 4,000 $870,000 Cost of goods sold $ 106,400 $ 173,600 $280,000