A graph showing the monthly cost of an electricity bill for May using the energy companyName: Date:

**Energy4U**is shown above. The monthly cost of an electricity bill using a different energy company

**Synergy**is calculated as follows:

**Total Cost (£) = Fixed Monthly Charge of £6.00 + £0.14 x Units of energy used**

1) Draw a graph showing the total monthly cost using the energy company

**Synergy**

2) Write down the Fixed Monthly Charge of

**Energy4U**in pounds

3) Calculate the cost per unit of energy used for

**Energy4U**, in pounds, up to 200 units of energy

4) What would be the total monthly cost with

**Energy4U**if 200 units were used?

5) If the total monthly cost with

**Synergy**is £55.00, how many units of energy were used?

6) Compare the total monthly cost of the two energy companies for different energy usages.

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3) The cost per unit of energy for

4) The total monthly cost of using 200 units with

5) 350 units of energy were used.

6)

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2) The Fixed Charge of**Energy4U**= £20.00

3) The cost per unit of energy for

**Energy4U**= £0.04 , if up to 200 units of energy are used.

4) The total monthly cost of using 200 units with

**Energy4U**= £28.00

5) 350 units of energy were used.

6)

**Synergy**is cheaper when less than 140 or more than 230 units of energy are used. They cost the same when exactly 140 or 230 units of energy are used.

**Energy4U**is cheaper in between 140 and 230 units of energy.

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