Stephanie works 40 hours a week at a wage rate of $25. This, her total weekly income is $1000. On this income, she pays total taxes of $80.00. However, she calculates that on the last hour that she works, she pays $6.25. Stephanie's average tax rate is nothing%. (Round your response to two decimal places.) Stephanie's marginal tax rate is nothing%. (Round your response to two decimal places.)

What is the relationship between marginal external cost, marginal social cost, and marginal private cost? a. marginal social cost equals marginal private cost plus marginal external cost. b. marginal private cost plus marginal social cost equals marginal external cost. c. marginal social cost plus marginal external cost equals marginal private cost. d. marginal external cost equals marginal private cost minus marginal social cost. marginal external cost a. is expressed in dollars, so it is not an opportunity cost b. is an opportunity cost borne by someone other than the producer c. is equal to two times the marginal private cost d. is a convenient economics concept that is not real