Decide whether each of the following statements is a normative statement or a positive statement, then explain your answer.

a. The gasoline tax is projected to yield $10 million in tax revenue next year.

b. If the gasoline tax was raised by 10 cents per gallon, the tax revenue from this tax would increase by 4%.

c. The state should raise the gasoline tax for the coming year. An increase in the tax will reduce congestion and smog, which is more important than the cost to commuters if they shift from private car transportation to public transportation.

d. Mandatory school enhances the work skills of students.

e. The age of mandatory school attendance should be extended since this will provide greater benefits to our economy.

f. An extension of mandatory school attendance will increase government education costs by $2 million for the state.