Question

Chris has a cell phone plan with a flat fee of $26.00 per month, plus a cost of $0.12 per minute of usage. Chris can only afford a monthly bill of $86.00. Which statement is true? A. Chris needs to use fewer than 400 minutes per month. B. Chris needs to use fewer than 450 minutes per month. C. Chris can afford to use up to 500 minutes per month. D. Chris can afford to use up to 550 minutes per month.

Answer 1

For this case we have that Chris's monthly telephone cost is given by:

$C (x) = 26 + 0.12x$

Where "x" represents each minute of use.

If Chris can only pay a $86 bill we have:

$26 + 0.12x \leq86\\0.12x \leq86-26\\0.12x \leq60\\x \leq \frac {60} {0.12}\\x \leq500$

The consumption of minutes must be less than or equal to 500 for each month. So the correct option is option C

ANswer:

Option C