Julia tunes pianos in her spare time for extra income. Buyers of her service are willing to pay $150 per tuning. One particular week, Julia is willing to tune the first piano for $115, the second piano for $125, the third piano for $140, and the fourth piano for $175. Assume Julia is rational in deciding how many pianos to tune. Her producer surplus is a.$25 b. $35 c. $70 d. $95

Which of the following describes one of the ways that the demographics of an area affect the price of housing in that area? a. when more people have children, their incomes tend to be higher and the housing prices are also higher. b. older people are more likely to stay in their houses, creating a seller's market that keeps prices low. c. an area with a lower population density won't have enough construction workers to build new houses quickly. d. an area with younger people will have a higher demand for rentals and a lower demand for buying.