The article "measuring and understanding the aging of kraft insulating paper in power transformers" (ieee electrical insul. mag., 1996: 28–34) contained the follow- ing observations on degree of polymerization for paper specimens for which viscosity times concentration fell in a certain middle range:

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

Helen tells her nephew, bernard, that she will pay him $100 if he will stop smoking for six months. helen was hopeful that if bernard stopped smoking for six months, he would stop altogether. bernard stops smoking for six months but then resumes his smoking. helen will not pay him. she says that the type of promise she made cannot constitute a binding contract and that, furthermore, it was at least implied that he would stop smoking for good. can bernard legally collect $100 from helen

Scoresby co. uses 6 machine hours and 2 direct labor hours to produce product x. it uses 8 machine hours and 16 direct labor hours to produce product y. scoresby's assembly and finishing departments have factory overhead rates of $240 per machine hour and $160 per direct labor hour, respectively. how much overhead cost will be charged to the two products? a. product x = $1,440; product y = $2,560 b. product x = $1,760; product y = $4,480 c. product x = $3,200; product y = $9,600 d. product x = $800; product y = $800