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Gemstone LLC produces kayaks and has recently adopted activity-based costing. Information on the following topics was gathered concerning the purchasing department: writing purchase orders for plywood. ordering key parts, number of plywood purchase orders written, number of key parts orders placed. The total overhead costs in purchasing is $600,000 of which $400,000 Is associated with writing purchase orders for plywood. If there are 40,000 purchase orders written for plywood, the overhead application rate for writing plywood purchase orders is Select one o a. $10 O b. $15 O C. Neither A nor