GV is a small accounting firm supporting wealthy individuals in their preparation of annual income tax statements. Every December, GV sends out a short survey to its customers, asking for the information required for preparing the tax statements. Based on 50 years of experience, GV categorizes its cases into the following two groups:

• Group 1 (new customers): 20% of cases
• Group 2 (repeat customers): 80% of cases

This year, there are 50 income tax statements arriving each week. In order to prepare the income tax statement, GV has three resources. The activities are carried out by the following three persons:

• An administrative support person that processes every tax statement.
• Senior accountant (who is also the owner): who processes only tax statements for new customers
• Junior accountant: who only processes tax statements for repeat customers.

(a) What is the total demand rate for the administrator?
(b) What is the total demand rate for the senior accountant?
(c) What is the total demand rate for the junior accountant?