Years ago, Ricky paid $500 for CDs to put together a collection. Today, he sold his CDs for $200. How does this sale affect current GDP?

ENGR.ECONOMIC ANALYSIS
14th Edition
ISBN:9780190931919
Author:NEWNAN
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Chapter1: Making Economics Decisions
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Suppose you are given the following information:
Qs =100+3P Qd =400–2P
where Qs is the quantity supplied, Qd is the quantity demanded and P is price.
a. From this information compute equilibrium price and quantity.
b. Now suppose that a tax is placed on buyers so that Qd =400–(2P+T)where T is taxes. If T = 15, solve for the new equilibrium price and quantity. (Note: You are solving for the equilibrium price for sellers and buyers). 
c. The income elasticity of Abigail’s demand for CDs is 0,75. For Abigail Cds are a normal good or an inferior good? Explain your answer. 
d. Years ago, Ricky paid $500 for CDs to put together a collection. Today, he sold his CDs for $200. How does this sale affect current GDP?

PLEASE NOTE THAT QUESTIONS a-c WERE PREVIOUSLY SUBMITTED and question d was mistakenly omitted from that submission so I only need help with question d. 

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