Answer:
37.96usd , 9.49usd
Explanation:
From the data given we have
cost of electricity= $0.13,
and annual cost of electricity is express as
Annual cost= power *hours*days*cost of electricity
note the unit of power must be in kilowatt(Kw),
a. to determine the cost of running 100w we first convert to kw
[tex]1w=0.001kw\\100w=0.1kw\\[/tex]
Hence the annual cost of running it 8.00 hours per day is calculated as
[tex]annual cost=0.1*8*365*0.13\\annual cost=37.96 USD[/tex]
b. to determine the cost of running 25w we first convert to kw
[tex]1w=0.001kw\\25w=0.025kw\\[/tex]
Hence the annual cost of running it 8.00 hours per day is calculated as [tex]annual cost=0.025*8*365*0.13\\annual cost=9.49 USD[/tex]
Hence from the answers we can conclude that less amount of money required to run the 25w incandescent bulb compare to the 100w
