Less than 10 percent of U.S. citizens own corporate stock

Based on the table above, what is the marginal revenue of the tenth unit of output?

A) $190 B) $100 C) $10 D) $9

Which of the following is an implicit cost of production?

A) interest paid on a loan to a bank B) wages paid to labor plus the cost of carrying benefits for workers C) rent that could have been earned on a building owned and used by the firm D) the utility bill paid to water, electricity, and natural gas companies