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

**Gold Star 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 £8.00 + £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

**Gold Star Electric**in pounds

3) Calculate the cost per unit of energy used for

**Gold Star Electric**, in pounds, up to 250 units of energy

4) What would be the total monthly cost with

**Gold Star Electric**if 300 units were used?

5) If the total monthly cost with

**Energy4U**is £24.00, 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 300 units with

5) 100 units of energy were used.

6)

© GCSEMathsWorksheets.com

# Answers

2) The Fixed Charge of**Gold Star Electric**= £18.00

3) The cost per unit of energy for

**Gold Star Electric**= £0.06 , if up to 250 units of energy are used.

4) The total monthly cost of using 300 units with

**Gold Star Electric**= £53.50

5) 100 units of energy were used.

6)

**Energy4U**is cheaper when less than 100 or more than 310 units of energy are used. They cost the same when exactly 100 or 310 units of energy are used.

**Gold Star Electric**is cheaper in between 100 and 310 units of energy.

© GCSEMathsWorksheets.com