Ox Company uses the FIFO method to compute equivalent units of production. It has unit costs of $10 for materials and $20 for conversion costs. If there are 2,500 units in ending work in process, 100% complete as to materials and 40% complete as to conversion costs, the total cost assignable to the ending work in process inventory is A) $45,000 B) $55,000 C) $75,000 D) $100,000 E) none of the above