In a certain city, electricity costs $0.15 per kW·h. What is the annual cost for
ID: 1078384 • Letter: I
Question
In a certain city, electricity costs $0.15 per kW·h. What is the annual cost for electricity to power a lamp-post for 5.50 hours per day with (a) a 100.-watt incandescent light bulb (b) an energy efficient 25-watt fluorescent bulb that produces the same amount of light? Assume 1 year = 365 days.
a).100 watt bulb. b). 25 watt bulb
(c) A typical incandescent bulb costs $0.89 and lasts for about a year; a typical energy efficient fluorescent bulb costs about $3.49 and lasts for about 3 years. Is the additional cost of the fluorescent bulb justified?
yes or no
please show works and explanation
Explanation / Answer
In a certain city, electricity costs $0.15 per kW·h. What is the annual cost for