Marks Corporation has two operating departments, Drilling and Grinding. and an office. The three categories of office expenses are allocated to the two operating departments using different allocation bases. The following information is avadiable for the current period: The amount of depreciation that should be allocated to Grinding for the current period is: Mullipie Choice $36,000 Caxan $36,000. $43,400. $13,680. $22,320. $70.000