Answer:
Only the market value of new finished goods are included in the GDP, so $10 would be added.
Step-by-step explanation:
Imagine a company that produces furniture. If we would include the wood, the nails, the wood paint, etc., were included in the calculation plus the furniture itself, you would be double-counting the cost of the manufactured furniture. If you consider waste materials, then you would be adding even more costs. That is why you only consider finished goods.