find the expected return for investing in buildings in a metro area where the following three buildings are for sale:(Explain How you get the values of probability)

The cost of the building is $2 million, the total rents are $700,000 and the total expenses are $500,000.

The cost of the building is $100 million, the total rents are $39 million and the total expenses are $32 million.

The cost of the building is $19 million, the total rents are $9 million and the total expenses are $7 million.

what would you expect is the cost of a building in that metro area if its rents are $5 million and the total expense are $5 million.

what would you expect is the net profit per year would be if a building in that metro area cost $50 million.