SOLUTION: The electric company in Hillsburg, Massachusetts charges its customers a flat fee of $20.00 per month plus four cents per kilowatt hour. If the monthly bill for the average custome

Algebra ->  Inequalities -> SOLUTION: The electric company in Hillsburg, Massachusetts charges its customers a flat fee of $20.00 per month plus four cents per kilowatt hour. If the monthly bill for the average custome      Log On


   

Question 980962: The electric company in Hillsburg, Massachusetts charges its customers a flat fee of $20.00 per month plus four cents per kilowatt hour. If the monthly bill for the average customer is between $60 and $80, find the range of the kilowatt (K) hours used for the month.
the answer has to be presented as an inequality, please help
Answer by macston(5194) About Me  (Show Source):
You can put this solution on YOUR website!
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K=kwh_used; M%5BL%5D=lowest_monthly_bill; M%5BH%5D=highest_monthly_bill
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%28M%5BL%5D-20%29%2F0.04<K<%28M%5BH%5D-20%29%2F0.04
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%2860-20%29%2F0.04<K<%2880-20%29%2F0.04
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40%2F0.04<K<60%2F0.04
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1000kwh<K<1500kwh
ANSWER: The range of kwh used is between 1000kwh and 1500kwh.