Answer:
$250
Explanation:
Given that
The cut down worth of the trees = $200
Worth of bookshelves = $250
Worth of lumber = $150
In order to find out the nation GDP, we recognize the final goods i.e book shelves price rather than the intermediate goods i.e trees and the lumber. It only deals with the market price of the goods i.e only with the bookshelves price. So only $250 is the final gods produced