First, take away $26.09 from $30. This will show you how much was spent on the call. You should get $3.91.
Next, it may be easier to convert this total all to cents. So 100 cents in every dollar...100 cents times 3 = 300 cents. Then add the other 91 cents to get a total of 391 cents.
Then, you need to divide 391 cents by 17 to get the minutes. And you'll get 23 minutes!
