Cambrian Railways runs a daily container freight train between Cardiff and Birmingham. Its two major customers are British Steel and the Welsh Farming Co-operative. The demand for containers by each customer is given by the equations:
P1 = 500- 8Q1 for British Steel
P2 = 400-5Q2 for Welsh farming.
P; is the price charged by Cambrian per container, and Q; is the number of containers used by each customer.

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