To determine: the minute that you have ti talk each month so that your average cost is less than $0.07 per minute
The person has to talk for more than 250 minutes to make the average cost per call less than $0.07.
Given information:
The phone company advertises a flat rate of $0.07 per minute for long-distance calls. The long-distance plan charges $5.00 per month plus a rate of $0.05 per minute.
Concept Used:
Substitution means replacing the variables (letters) in an algebraic expression with their numerical values.
Calculation:
Let the number of minutes used per month be x .
The cost is expressed as the product of the number of minutes used and the cost per minute.
The total cost can be expressed by the sum of the fixed charge and the cost of usage.
The average cost is given by the total cost divided by the number of minutes used.
The average cost has to be less than $0.07.
Solve for x .
Chapter 5 Solutions
Holt Mcdougal Larson Algebra 2: Student Edition 2012
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