Please include all details

Questin 1 A population of 5 cargo aircrafts eacle produces a profit of $ 200 per hour when not wanting to be unloaded. The time between arrivals is distributed exponentially with a mean of 80 hours. The unloading time at the ramp is distributed exponentially with a mean of 20 hours. It costs $ 100 per hour to lease a ramp with unloading capacity, What is the total cost of the system 4 two ramps are leased? Hint: Use finite queue table