Use the Following to Answer Question(s): Marginal Benefits and Marginal

Multiple Choice

Use the following to answer question(s) : Marginal Benefits and Marginal Costs

-(Exhibit: Marginal Benefits and Marginal Costs) In the exhibit, more time spent studying economics adds points to economics scores but subtracts points from accounting scores.When the student studies economics for 4 hours, the marginal benefit is _______ ; when the student studies for 6 hours, the marginal benefit is _______.

A) 20; 10
B) 30; 10
C) 20; 0
D) 20; 30