You are given the following information on two types of photocopying machines. The Exone has a fixed cost of £400 per annum and a running cost of £20 per 1000 copies. The Fastrack has a fixed cost of £300 per annum and a running cost of £25 per 1000 copies. Express the cost for each machine by means of an equation and calculate the cost corresponding to a requirement for 10 000, 20 000, 30 000, 40 000 and 50 000 copies per annum. Comment on your findings.