Refer to the table above. If the price of a chair increases to $15, and the rental price of machines is $90 per day, up to how many machines should the firm rent to maximize profits?

If stocks are more risky than bonds, why would a rational investor ever buy stocks?

The price elasticity of demand is defined as

a. the absolute change in price divided by the absolute change in quantity demanded. b. the absolute change in quantity demanded divided by the absolute change in price. c. the percentage change in quantity demanded divided by the percentage change in price. d. the percentage change in price divided by the percentage change in quantity demanded.