4- A\" economy Produces 1,000,000 computers Valued at $2,000 each. Of these, 200,000 are sold to consumers, 300,000 are sold to businesses, 300,000 are sold to the govgrnment, and 100,000 are sold abroad. No computers are imported. The unsold computers at the end of the year are held in inventory by the computer manufacturers. a. What is the total contribution to GDP from these transactions? b. What is the total value of investment expenditure