Answer:
money saved per class is:$1.334
Explanation:
if a student will take a 5 week class i.e. 15 classes then he has to pay $120
this means he has to pay $

but if a student will take 8 week classes i.e. 24 classes then he has to pay $160
this means he has to pay $

so clearly it could be observed that a person would save by taking 8 week classes.
money saved per class by taking 8 week classes=$8-$6.666
=$1.334