...A standard 75-watt lightbulb costs $0.75 nad lasts about 800 hr. An energy efficient flourescent bulb that gives off th esame amount of light costs $5.00 and lasts about 10,000 hr.
1.) how many standard lightbulbs would needed to provide 10,000 hr of light?
10000/800 = ? , round to the nearest whole number since you cannot buy a fraction of a bulb
2.) How much would it cost using standard lightbulbs to provide 10,000 hr. of light?
(solution to #1) times (cost of a standard bulb)
3.) which one is more cost effective long term?
what do you think?