SOLUTION: An electric power company charges its consumers $ 0.40 per kilowatt for the first 100 kilowatts in a month, $ 0.50 per kilowatt for the second 100 kilowatts, and $ 0.60 for each ad
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Question 359544: An electric power company charges its consumers $ 0.40 per kilowatt for the first 100 kilowatts in a month, $ 0.50 per kilowatt for the second 100 kilowatts, and $ 0.60 for each additional kilowatt beyond. Mary pays $ 120 for electricity used in last month.How much electricity did her family consume in the month? Answer by ankor@dixie-net.com(22740) (Show Source):
You can put this solution on YOUR website! An electric power company charges its consumers $ 0.40 per kilowatt for the
first 100 kilowatts in a month,
$ 0.50 per kilowatt for the second 100 kilowatts,
and $ 0.60 for each additional kilowatt beyond.
Mary pays $ 120 for electricity used in last month.
How much electricity did her family consume in the month?
:
Let x = total no. of kwh used in a month
:
.6(x-200) + .5(100) + .4(100) = 120
.6x - 120 + 50 + 40 = 120
.6x - 30 = 120
.6x = 120 + 30
.6x = 150
x =
x = 250 kwh used
:
:
See if this is true
.4(100) = 40
.5(100) = 50
.6(50) = 30
---------------
total$ = 120
:
:
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