An outdoor spa (hot tub) draws 1487 watts to keep the water warm. If the utility company charges $0.13 per kilowatt-hour, how much does it cost to operate the spa for four months during the winter (24 hours per day) ? Assume each month has 30 days.

Answer:$556.73

Step-by-step explanation:

Watts (1487) multiplied by the hours used daily (24) = 35688

Divided by 1000 = 35.68

multiply 35.68 times the number of days (120) = $556.73

Another example:

wattage x hours used : 1000 x price per kWh = $$

1487 x 2880 : 1000 x $0.13 = $556.73