Asked by Macy

A phone company offers two monthly plans. Plan A costs
$11
plus an additional
$0.18
for each minute of calls. Plan B costs
$18
plus an additional
$0.13
for each minute of calls. For what amount of calling for the two plans cost the same? What is the cost when the two plans cost the same?

Answers

Answered by Macy
I know in order to find the amount of the calling plans you have to set up a table and multiply until you get the same number but I posted this question because I have no absolute way to do it.
Answered by PsyDAG
11 + .18m = 18 + .13m

Solve for m, then substitute value for m on either side.
Answered by Reiny
costA = 11 + .18m
costB = 18 + .13m

they are the same when
11+.18m = 18 + .13m
.18m - .13m = 18 - 11
.05m = 7
m = 7/.05 = 140

at 140 minutes they are the same

costA = 11 + .18(140) = $36.20

You do costB and show that my answer is correct.
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