Java to Go is a drive through espresso bar. Customers arrive at a rate of 40 per hour and form a single line. There is a service window on each side of the building and the two baristas pull customers from the same line. Each barista can serve 20 customers per hour. If there are more than four (4) cars waiting, there is no room for anyone else to join the queue. The average customer spends $5 per visit. What is Java to Go's average hourly revenue (rounded to the nearest multiple of 10 dollar)?