9. *How much do each of the following contribute to GDP?

a. Jones pays a repair shop $1,000 to rebuild the engine of her automobile.

b. Jones spends $200 on parts and pays a mechanic $400 to rebuild the engine of her automobile.

c. Jones spends $200 on parts and rebuilds the engine of her automobile herself.

d. Jones sells her four-year-old automobile for $5,000 and buys Smith’s two-year-old model for $10,000.

e. Jones sells her four-year-old automobile for $5,000 and buys a new car for $20,000.