Microeconomics 6th Edition by Robert Hall, Shirley Kuiper, Marc Lieberman

Exercise 18

Suppose that 1,000 people in a market each have the same monthly demand curve for bottled water,given by the equation Q D = 100;? 25 P,where P is the price for a 12-ounce bottle in dollars.
a. How many bottles would be demanded in the entire market if the price is $1?
b. How many bottles would be demanded in the entire market if the price is $2?
c. Provide an equation for the market demand curve,showing how the market quantity demanded by all 1,000 consumers depends on the price.