Dan's long-distance phone carrier charges him $3.95 a month for service. In addition, Dan is charged 5 cents a minute for the calls he makes. If his monthly bill is $48.50, how many minutes of calls did he make?

Question

1830 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2016-11-11T15:08:57

Dan made 891 minutes of calls.

The formula for the cost of Dan's phone can be written as:

$c = $3.95 + ($0.05 xx m)$ where $c$ is the total cost and $m$ is the minutes of calls he made.

Because we know $c$ we can update this equation to:

$$48.50 = $3.95 + ($0.05 xx m)$

Solving for $m$ while keeping the equation balanced gives:

$$48.50 - $3.95 = $0.05 xx m$

$$44.55 = $0.05 xx m$

$($44.55)/($0.05) = ($0.05 xx m)/($0.05)$

$m = 891$