Consider Polly's individual demand curve for fitness classes: QD = 230 10P. Suppose this is Polly's

monthly demand curve.

a. How many fitness classes would Polly be willing and able to purchase this month if the price of fitness

classes is $20 per class?

b. How many fitness classes would Polly be willing and able to purchase this month if the price of fitness

classes is $30 per class? Think carefully here about your answer and if you are a visual person, draw a

detailed graph of Polly's demand curve to see what's happening.

c. What is the most Polly would be willing to pay for the 10th fitness class this month? What do we call this in

economics?

d. Graph Polly's individual demand curve. Label all key features of your graph. Polly tells you that after some

events have occurred her new demand curve for fitness classes is given by QD = 200 10P. Graph Polly's

new demand curve for fitness classes. Has demand increased or decreased? Name one factor that could have

changed Polly's demand curve in this way.