本人要找一个国际经济学的高手作家教，我老板是美国海归，每星期布置一次作业，不会超过10道题，他精通西方经济学，国际经济学，国际贸易理论，我理论功底不够扎实，所以有困难，很着急，请你帮忙辅导一下作业，并能讲到我懂，报酬每次作业２００元。以下是这次作业，如果你觉得自己没问题，可以与我联系 aze20042004@yahoo.com.cn,

Diagram a PPF with the following points on it: (X,Y)= (100,0); (90,25); (70,50); (40,75); and (0,100).

a. Demonstrate that this PPF exhibits increasing opportunity costs of production.

b. Using your diagram from (a), estimate the marginal rate of transformation when 90 units of X are consumed and 25 units of Y are consumed. (hint: draw the relative price line). What is the value of consumption in terms of units of Y? what is the value of national income in terms of units of X? If the price of X is $3 billion per unit, find nominal national income.

c. Using the same PPF, estimate the relative price needed to shift production from (90,25) to (75,40).