Question

For his long distance phone service, Bill pays an $8 monthly fee plus 6 cents per minute. Last month, Bill's long distance bill was $13.64. For how many minutes was Bill billed?

Answer 1

The long distance bill is

Monthly fixed $8

Monthly variable $0.06 per minute

If the cost is c and minutes m, we can write cost as:

$c=8+0.06m$

Given, last month's cost, c, to be $13.64, we want to find the minutes.

We put 13.64 into 'c' of the formula found and find m.

Shown below:

$\begin{gathered} 13.64=8+0.06m \\ 13.64-8=0.06m \\ 5.64=0.06m \\ m=\frac{5.64}{0.06} \\ m=94 \end{gathered}$

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