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One prepaid cell phone company charges $0.029 per minute and a $4 monthly fee. Another company charges $0.034 per minute with no monthly fee. For what number of minutes per month are the charges for the first company cheaper?

 Oct 19, 2018
 #1
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We want to solve this inequality

 

Total cost of 1st company < Total cost of second company

 

.029 N +  4  < .034N      where N is the number of minutes we are looking for

 

subtract  ,029N from both sides

 

4 < .005N    divide each side by .005N

 

4 / .005  < N

 

800 < N

 

The first company will be cheaper after 800  minutes

 

 

cool cool cool

 Oct 19, 2018

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