a.
The unit can be found by doing $740/50 students. That gives us 14.8.
Hence the unit rate would be $14.80 per student.
b.
Now we use the rate to find how much money the seventh graders raised.
The rate is $14.80 per student so we do $14.80 x 60 students. That gives us 888. The seventh-grade class raised $888.
