Amechanic builds an engine and then sells it to a customized body shop for $7,000. the body shop inserts the engine into the car and resells it to a dealer for $20,000. the dealer then sells the finished vehicle for $42000. a. when the consumer drives off with the car, gdp increases by $ . b. what is the value added by the mechanic? (assume that the value of the materials used to build it is zero.) $ c. what is the value added by the body shop? $ d. what is the value added by the dealer? $ e. the total value added is the amount that gdp increased.