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The national average is 3 hours per day. a. If a water heater uses 4,200 watts, find the daily cost of running it at a cost of $0.11 per kilowatt-hour.

Respuesta :

The national average is 3 hours per day. a. If a water heater uses 4,200 watts. The daily cost of running it at a cost of $0.11 per kilowatt-hour is $1.40.

Wattage per hour = 4,200 watts per hour

The average number of hours = 3 hours

Cost per unit = $0.11

Total wattage = product of wattage per hour and a number of hours.

Total wattage (per day) = wattage per hour × number of hours

                                       = 4,200 watts per hour × 3 hours

                                       = 12,600 watt-hours or 12.6 kilowatt-hours

Total cost = total wattage × cost per unit

                = 12.6 kilowatt-hours × $0.11 per kilowatt-hour

                = $1.386 or approximately $1.40

What is an average?

  • The average is the mean value which is equal to the ratio of the sum of the given numbers to the total numbers.
  • The formula for average = sum of values/number of values
  • Average is used to represent a set of large numbers with a single number.

To learn more about average, visit:

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