<PRE><B>Question 985786</B>
Hi dear,
She can make calls in 90 minuites
HERE IS THE WORKING:
If call cost per minuite =$0.05
Each massage sent cost $0.20
And Total money she has=$8.50
Then,
Cost of 20 text 
massage=20*$0.20
=$4.0
Ammount left after 20 text massage =$8.50-$4.0
=$4.50
If $0.05 is call cost per minuites,
Then,
$4.50=(4.50/0.05)min
  =90min
HOPE THIS HELPS?
Timnewman::           </PRE>