Question

You are looking at your power bill for the month; you pay 9 cents per kilowatt-hour. Running a 60-watt light bulb for 1 hour is 0.06 KWH. If you leave a light on all the time that has 2 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.

a. $1.82
b. $2.54
c. $3.64
d. $4.26

Answer 1

By calculation, running two 60-watt bulbs continuously for a month cost around $7.78, but this correct answer is not listed among the choices provided. There may be an error in the question or provided options.

Step-by-step explanation:

Let's calculate the cost of running a light fixture with 2 bulbs of 60 watts each for a 30-day month. If you pay 9 cents per kilowatt-hour (kWh) and running a 60-watt bulb for 1 hour equals 0.06 kWh, then each bulb costs:

0.06 kWh/bulb × $0.09/kWh = $0.0054 per hour for one bulb.

For two bulbs, this cost doubles, making the hourly cost:

$0.0054 × 2 = $0.0108 per hour for both bulbs.

Now, calculate the total monthly cost:

$0.0108 per hour × 24 hours/day × 30 days = $7.776 for the month.

Therefore, the cost of leaving the light on all the time for a 30-day month would round off to $7.78, which is not an option in the provided choices, indicating that there may have been a mistake in the question or the options provided. The closest option, $7.78, is not among the answer choices of a. $1.82, b. $2.54, c. $3.64, d. $4.26, and thus there appears to be an error.