Question

Linda purchased a prepaid phone care for $15. Long distance calls cost 18 cents a minute using this care. Linda used her card only once to make a long distancecal. If the remaining credit on her card is $8.16, how many minutes did her call last?

Answer 1

her last call was 38 minutes

Step-by-step explanation:

Given;

Long distance calls cost 18 cents a minute = $0.18 per minute

Initial credit = $15

Final credit after call = $8.16

The amount of credit C used to make the long distance call is;

C= initial - final credit

C = $15 - $8.16

C = $6.84

Then the number of minutes N used can be calculated by;

`N=(C)/(R)`

R = rate = $0.18 per minute

substituting we have;

`\begin{gathered} N=(6.84)/(0.18) \\ N=38 \end{gathered}`

Threrefore, her last call was 38 minutes