How much does it cost to run a 1500-W hair dryer for 45 minutes each day for one month (30 days) at a cost of 7¢ per kWh? $

Answer 1

45 minutes = 45/60 hrs = 0.75 hrs

30 days x 0.75 hrs per day = 22.5 hrs

1500 W = 1.500 kW

So 22.5 hrs x 1.500 kW = 33.75 kWh

7c per kWh so 7 x 33.75 = 236.25 c or $ 2.36