Final answer:
Mr. Wu's class has earned $120, which is 20% of their class goal. Mr. Green's class has earned $138, which is 23% of their class goal.
Step-by-step explanation:
To determine the money earned by each class, we need to find one-fifth of $600 for Mr. Wu's class and 23% of $600 for Mr. Green's class.
1. Mr. Wu's Class: Fraction: 1/5 Decimal: 0.2 Percent: 20%
2. Mr. Green's Class: Fraction: 23/100 Decimal: 0.23 Percent: 23%