A class of n students was raising money for a field trip. They have earned $800 so far. Each student

A class of n students was raising money for a field trip. They have earned $800 so far. Each student plans to work x more hours at a wage of y dollars per hour. When they are done, how much money will they have earned?

Class of n students * x more hours worked * y dollars per hour = xyn

Total dollars earned includes the $800 already earned:
$800 + xyn