Question

You are looking at your power bill for the month, you pay 12 cents per kilowatt-hour. Running a 60 watt light bulb for 1 hour is .06 KWH, if you leave a light on all the time that has 5 light bulbs in it how much would that cost in a 30 day month? Answer in the form of $2.54 without the dollar sign.

Answer 1

Total electricity consumed per day

• 24(0.06)
• 1.44Kwh

Consumed in 30days

• 30(1.44)
• 43.2Kwh

For 5bulbs

• 5(43.2)
• 216kwH

Cost

• 216(0.12)
• $25.92

Answer 2

• $25.92

Explanation:

• 1 bulb in 1 hour = 0.06 kWh
• Unit of cost = 12 cents per kWh = $0.12 per kWh

5 bulbs in 30-day month will consume electricity:

• 5*0.06*30*24 = 216 kWh

The total cost is:

• 216 * 0.12 = $25.92