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Utilitiy Expenses

Last updated over 1 year ago

10 questions

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Question 1

1.

Emily’s last water bill listed a previous reading of 7,123 ccf and a present reading of 7,171 ccf. Her water company charges $0.73 per ccf of water. What should Emily have been charged on her last water
bill?

$48

$148

$35.04

$3.50

Question 2

2.

Bill Heckle’s last electric bill is shown below:
Although the info is missing, the units of usage is given in kilowatt-hours.

How many kilowatt-hours of electricity did Bill use during the service period shown?

21,780

24,100

2,320

1575

Question 3

3.

Observe the above bill. What did Wattco charge per kilowatt-hour of electricity?

$0.11

$9.09

$23.02

0.02

Question 4

4.

The bill covers 31 days of electric use. What was Bill’s average daily expense for electricity for this service period? Round to the nearest cent.

$0.11

$8.23

$0.12

$7.25

Question 5

5.

Home heating oil is sold by the gallon. Last winter, the Romano family used 370 gallons of oil at a price of $3.91 per gallon. If the price increases 9% next year, what will their approximate heating expense be? (Assume they will use ~370 gallons again)

$1446.7

$1576.90

$4.26

$4.23

Question 6

6.

The PA system at North High School requires 400 watts per hour when it is switched on. How much would it cost to run for 3 hours, at a cost of $0.10 per kilowatt-hour?

$0.12

$120

$15

$0.10

Question 7

7.

Last winter, Anne was charged $838.35 for 9,315 kWh of electricity.
What did her company charge per kilowatt-hour of electricity?

$0.12

$0.09

$0.15

Question 8

8.

The Lisbon’s new heat pump cost $4,500. They bought it to replace their old furnace and air conditioner
which cost about $2,800 a year to run. The heat pump will save them approximately 39% a year. In how
many years will the heat pump pay for itself? Round to the nearest tenth.

10.2 years

3.7 years

4.1 years

3.9 years

Question 9

9.

Jessica’s parents are always telling her to turn off the lights when she leaves a room. A light bulb requires 75 watts per hour to run when it is turned on. The fixture in Jessica’s room requires four of these bulbs.

Jessica’s parents estimate that she leaves the lights on unnecessarily for 2.5 hours per day. How many watt-hours of electricity are used by these bulbs during 2.5 hours?

75 w-h

750 w-h

300 w-h

30 w-h

Question 10

10.

Continuing from the above scenario, Approximately how many kilowatt-hours of electricity are used in a year to keep these bulbs lit for 2.5 hours per day?

273.75 kw-h

365 kw-h

389 kw-h

273,750 kw-h