Q 17.69: A firm uses Machine Y exclusively in the manufacture of Product Y and Machine Z exclusively in the manufacture of Product Z. The firm uses straight-line depreciation and all depreciation costs for the firm's equipment are allocated using the traditional costing method based on machine hours. In this scenario, if the firm decides to reduce the number of hours it runs Machine Y, then the amount of Machine Y's depreciation that is allotted to Machine Z will A stay the same. A B drop to 0. C decrease. increase