Question

A 180-watt iHome® is used on an average of three hours a day. Find the cost of listening to the iHome for one week at a cost of $0.13 per kilowatt-hour.

A. $0.49

B. $11.34

C. $491.40

D. $0.07

Answer 1

Hello!

The answer is:

The correct option is:

A. $0.49

Why?

From the statement, we know that the iHome is used on average three hours a day, and we are asked to find the cost for a week, so first, we need to calculate the total hours that the iHome is used for, and then, calculate the kilowatt-hour consumption rate.

`TotalTime_(week)=3(hours)/(day) *7days=21hours`

`TotalEnergyConsumption_(week)=180watt*21hours=3780watt.hour`

Now, we must remember that:

`1Kilowatt=1000watts`

So,

`3780watts=3780watts.hour*(1KiloWatt)/(1000watts)=3.78KiloWatt.hour`

Then, calculating the cost, we have:

`TotalCost_(week)=0.13(dollar)/(killowat.hour)*3.78killowat.hour=0.49(dollar)`

Hence, we have that the correct option is:

A. $0.49

Have a nice day!