Fixed costs remain constant at $400,000 per month. During high-output months variable costs are $320,000, and during low-output months variable costs are $80,000. What are the respective high and low indirect-cost rates if budgeted professional labor-hours are 16,000 for high-output months and 4,000 for low-output months?

A) $45.00 per hour; $120.00 per hour

B) $45.00 per hour; $45.00 per hour

C) $25.00 per hour; $20.00 per hour

D) $56.20 per hour; $120.00 per hour