Susan wishes to buy gasoline and have her car washed. She finds that if she buys 9 gallons of gasoline at $1.50 per gallon, the car wash costs $1, but if she buys 10 gallons of gasoline, the car wash is free. For Susan, the marginal cost of the tenth gallon of gasoline is:

In the above table, the average variable cost at 2 units of output is

A) $1.00. B) $2.00. C) $4.00. D) $4.80.

According to the law of diminishing utility, _____

a. the same tax rate should be applied to every dollar b. the rich people should have a lower tax rate as compared to poor people c. the rich people should have a higher tax rate as compared to poor people d. the total burden on the society from a tax will be less if proportional taxation is used e. the poorer people should not be taxed at all