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

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

**Energy4U**is calculated as follows:

**Total Cost (£) = Fixed Monthly Charge of £7.00 + £0.16 x Units of energy used**

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

**Energy4U**

2) Write down the Fixed Monthly Charge of

**Green Electric**in pounds

3) Calculate the cost per unit of energy used for

**Green Electric**, in pounds, up to 150 units of energy

4) What would be the total monthly cost with

**Green Electric**if 100 units were used?

5) If the total monthly cost with

**Energy4U**is £31.00, how many units of energy were used?

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

© GCSEMathsWorksheets.com

Show Answers
Hide Answers

3) The cost per unit of energy for

4) The total monthly cost of using 100 units with

5) 150 units of energy were used.

6)

© GCSEMathsWorksheets.com

# Answers

2) The Fixed Charge of**Green Electric**= £18.00

3) The cost per unit of energy for

**Green Electric**= £0.06 , if up to 150 units of energy are used.

4) The total monthly cost of using 100 units with

**Green Electric**= £24.00

5) 150 units of energy were used.

6)

**Energy4U**is cheaper when less than 110 or more than 170 units of energy are used. They cost the same when exactly 110 or 170 units of energy are used.

**Green Electric**is cheaper in between 110 and 170 units of energy.

© GCSEMathsWorksheets.com