In an area in which electricity costs 8 cents/kilowatt-hour, a 5 kw clothes dryer runs for 90 minutes to dry a load of laundry. how much did it cost to dry these clothes?

Cost to dry the clothes is 60 cents.

Explanation:

Power of the dryer =  5 kW

Time taken by the dryer to dry the cloths = 90 min = 1.5 hr

Power consumed in 1.5 hours =

Cost of electricity in an area =  8 cents/kilowatt-hour

So, cost for 7.5 kW-hour wil be:

Cost to dry the clothes is 60 cents.