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A family of four lives in a three-bedroom house and uses an average of 900kwh of electricity per month. The family cools their house for three months during the summer with two window-unit air conditioners that each use 350kwh of electricity per month. Which of the following is the percentage of the family’s total annual electricity that is used to run the two air conditioners for the three summer months?.

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adioabiola

The percentage of the family’s total annual electricity that is used to run the two air conditioners for the three summer months is 20.83%

How to calculate percentage

  • Average consumption of electricity by the family per month = 900 kWh

  • Number of months in a year = 12

Total electricity consumed in a year = 900 x 12

= 10800 kWh

  • Each of the 2 window-unit air conditioners uses =350 kWh per month

  • Total used per month = 2 x 350

= 750 kWh

Recall, the family uses air conditioners for 3 month,

Total consumption for 3 months = 3 x 750

= 2250 kWh

Percentage of the family’s total annual electricity used to run the two air conditioners for the three summer months = 2250 kWh / 10800 kWh × 100

= 0.20833333333333 × 100

= 20.83%

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Universidad de Mexico