Question

Electricity from the local power company costs 7.22 cents/kWh. A homeowner wishes to pay a maximum of 25 cents per month for the electricity to power a stereo system. For how many hours per month could the stereo system be used?

Answer 1

You haven't said how much power the stereo uses. It matters !

Whatever that number is, the maximum hours per month is

(3460) divided by (the # of watts the stereo uses when it's playing) .

Answer 2

The power rating of the stereo is not stated and this makes the question incomplete, however, we can make the stereo rating x (this is a basic power calculation)

Step-by-step explanation:

To calculate the number of hours the homeowner can get,

First, divide the total amount (25cents) by power cost (7.22 cents/kWh) and multiply by 1000 (to convert kilowatt to watt).

This gives us
`(3462.6W/h)/(x)` as shown below.

`(25X1000 )/(7.22x)= 3462.6/x`

Finally, whatever the stereo rating is, insert it as x and solve for the number of hours.