Economics Help Asap-thanks :)?

A sporting goods store has estimated the demand curve for a popular brand of running shoes as a function of price. Use the diagram to answer the questions that follow.
a. Calculate demand elasticity using the midpoint formula between points A and B, between points C and D, and between points E and F.
*On this problem, I already solved it by using the diagram that is illustrated in my textbook.* I just need help with problems b and c below. Thank you.
A and B
P1= 60 P2= 50 Q1= 100 Q2= 200
For Points A and B, I got -3.72 elastic as the answer.
C and D
P1= 40 P2= 30 Q1= 300 Q2= 400
For Points C and D, I got -1 unitary elastic as the answer.
E and F
P1= 20 P2= 10 Q1= 500 Q2= 600
For Points E and F, I got -0.27 inelastic as the answer.
b. If the store currently charges a price of $50, then increases that price to $60, what happens to total revenue from shoe sales (calculate P x Q before and after the price change)? Repeat the exercise for initial prices being decreased to $40 and $20, respectively.
c. Explain why the answers to a. can be used to predict the answers to b.

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