Question

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 1

Answer:$556.73

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

Answer 2

$556.7328 is total cost of operating hot tub for 4 months in an outdoor spa.

Explanation:

Power drawn by hot tub = 1487 Watts = 1.487 kiloWatt

1 Watt = 0.001 kiloWatt

Utility charges charged by the company = $0.13 / (kiloWatt hour)

Charges in 1 day or 24 hours : (1 day = 24 hours)

$0.13 / (kiloWatt hour) × 1.487 kiloWatt × 24 hours = $4.63944

4 months = 4 × 30 = 120 days (1 month = 30 days)

Total charge for operating hot tub for 4 months or 120 days:

$4.63944 × 120 = $556.7328