Why is the period from late 20s to early 40s the best time for becoming an entreprnur?

The rybczynski theorem describes: (a) how commodity price changes influence real factor rewards (b) how commodity price changes influence relative factor rewards. (c) how changes in factor endowments cause changes in commodity outputs. (d) how trade leads to factor price equalization.

John has served as the chief operating officer (coo) for business graphics, inc., a publicly owned firm, the past 5 years. which of the following statements about john is correct? both john and the ceo of business graphics must certify to the sec that the firm's financial statements are accurate. as the coo, john will be ranked higher than the ceo but still below the cfo. in john's postition as the coo, it is highly unlikely that he would also be the chairperson of the board of directors. as the coo, john would typically be involved with accounting, finance, and asset purchase decisions.

Mr. pines is considering buying a house and renting it to students. the yearly operating costs are $1,900. the house can be sold for $175,000 at the end of 10 years and it is considered 18% to be a suitable annual effective interest rate. if the house costs $100,000 to purchase, how much would you need to charge your tenants each year in rent? (assume a single payment for the years rent at the end of each year)