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?
$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.
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.
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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