A contractor owns a unit of equipment that costs $$20/$hour$,$ based on a usage of $1,800$ work hours per year. For this equipment, the annual cost of ownership can be calculated as $$20/$hour x $1,800$ hours $=$ $$36,000$ per year. Suppose this equipment can be rented for $$4,000$ per month, $$1,500$ per week, or $$500$ per day. Determine the hourly costs of rental.

For monthly rental, what is the cost per hour?