Can you please show your work?

Calculation: Department A and Department B are each considering renting a copy machine for work needed during the month. Department A needs the machine 100 hours, and Department B needs the machine 400 hours. Normally, the machine rental is $50/hour. If A and B rent together, the hourly rate becomes $45/hour. Using the incremental cost method, and assuming that B is the primary user, how much of the cost is allocated to A? 0 4,500 O 12,250 O None of the choices is correct 0 20,000 O 5,000 2,500