Answer:
$6.50
I don't know if it is right, but here you go
Step-by-step explanation:
First thing we do is find how much 25 text messages cost
divide 200 by 4
=50 text messages for one dollar
divide by 2
=25 text messages for 0.50 cents
divide 325 by 25
=13
multiply by 0.50
=6.5
