A person has a $100,000 annual income. The interest rate is 10%. This person is considering an investment in a piece of land that costs now $70,000. At the same time, this person wants to consume $60,000 this year. 

a) Detail a plan of investment and borrowing or lending that would permit this person to consume 60,000 euro this year if the land investment is worth 75,000 euro next year. 

b) Detail a plan of investment and borrowing or lending that would permit her to consume 60,000 euro this year if the land investment is worth 80,000 euro next year. 

c) In which of these cases should a person invest in the land? 

d) In each of these cases, how much will this person be able to consume next year?