b) The salary of the server at the first stage is 5KD per hour and the value of the timin customer spends waiting in line is expected to be 3KD per customer-hour. Whan is c) What is the effective service rate at the second stage? d) The salary of each server at the second stage is 10 KD per hour' customer spends waiting in line is expected to be 9 KD per cust b) The salary of the server at the first stage is 5KD per hour and the value of the timin customer spends waiting in line is expected to be 3KD per customer-hour. Whan is c) What is the effective service rate at the second stage? d) The salary of each server at the second stage is 10 KD per hour' customer spends waiting in line is expected to be 9 KD per cust