Question

A 100 watt incandescent light bulb is operated for 120 hours, and a 15 watt fluorescent light bulb is operated for the same period of time. At 10 cents per kWh, what is the cost savings of the fluorescent bulb?

Answer 1

$1.02 or 102 cents

Step-by-step explanation:

According to given information

Total consumption Time = 120 Hours

Cost Saving per hour = Cost per hour x Saving in kilowatts per hour

Cost Saving per hour = Cost per hour x ((100 watts - 15 watts) / 1000)

Cost Saving per hour = $0.1 x (100-15)/1000 = $0.0085 kwh

Total Cost Saving = 120 x 0.0085 kwh = $1.02 or 102 cents