Amelia uses 6 pieces of fabric per square foot to make a blanket.

How many pieces of fabricThe classes at the middle school want to raise money.

The sixth grade runs a bake sale for 5 hours and makes $170.
The seventh grade sets up a dunking booth for 4 hours and makes $112.
The eighth grade has a car wash and makes $192 in 6 hours.

Which class has the highest rate for raising money?

will she need to make a blanket that is 720 square inches?