Question 1117903
<br>
The number of additional minutes between the two given points is 61-28=33.  The difference in the remaining balance on the phone card is $26.08-$21.46 = $4.62.<br>
The charge per minute for using the phone card is $4.62/33 = $0.14.<br>
For 27 more minutes, the remaining balance will decrease by 27($0.14) = $3.78, leaving a balance of $21.46-$3.78 = $17.68.