Customers arrive according to a Poisson process at a mean rate of 20 per hour. The service time follows an exponential distribution with a mean rate of 24 customers per hour. Suppose each server costs $20 per hour. The goodwill cost for a customer waiting in line is $30 per hour and the goodwill cost for a customer waiting in service is $10 per hour. What is the total hourly cost when there are 2 servers in place