Question 1 (25 marks) Suppose you are a Business Analyst of a telephone company. The phone company has two plans to offer to its customers as follows: Plan A: Phone Bill = 30 + 0.4 T and Plan B: Phone Bill = 60 + 0.2 T Where T = time of calls in minutes

(a) Draw the graphs for the two plans in a single plane. (5 marks)

(b) Calculate how many minutes make the two plans cost the same? (8 marks)

(c) Calculate the phone bill for the call time calculated in (b) above. (4 marks)

(d) If a customers average call time is 250 minutes, which plan would you suggest to this customer? Explain why? (8 marks)