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Mobile Phones I am investigating 3 rates of charges for people using mobile phones. Scheme 1: A payment of £15 per month for the line rental, plus 50p per minute for each call made Scheme 2: A payment of £24 per month for the line rental, plus 20p per minute for each call made Scheme 3: A payment of £31 per month for the line rental, plus 10p per minute for each call made. I am going to investigate which scheme is best for people using mobile phones. I will also vary the line rental, vary the cost of each call, make comparisons, and make generalisations. I will show graphs, tables and a conclusion to my investigation. Scheme 1: A payment of £15 per month for the line rental, plus 50p per minute for each call made. X Minutes Cost (£) 5 £17.50 10 £20 15 £22.50 20 £25 30 £30 40 £35 50 £40 60 £45 70 £50 80 £55 Scheme 2: A payment of £24 per month for the line rental, plus 20p per minute for each...

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