A 100-W driveway light bulb is on 10 hours per day.If the power company charges 10¢ for each kilowatt-hour of electricity used,estimate the yearly cost to operate the bulb if it is used every day for a 365-day year.
A)$3.65
B)$7.30
C)$37
D)$73

Question

Quizplus · Accepted Answer

First, we need to convert the wattage to kilowatts:

100 W = 0.1 kW

Next, we can find the daily energy usage:

0.1 kW × 10 hours = 1 kWh

Finally, we can find the yearly cost:

1 kWh/day × 365 days/year = 365 kWh/year

365 kWh × $0.10/kWh = $36.50

Rounding to the nearest dollar gives us the final answer of $37, which is choice C.

A 100-W Driveway Light Bulb Is on 10 Hours Per