Last year, a small nation with abundant forests cut down $200 worth of trees. it then turned$100 worth of trees into $150 worth of lumber. it used $100 worth of that lumber to produce$250 worth of bookshelves and exported as a final good the remaining lumber. assuming thecountry produces no other outputs, and there are no other inputs used in producing trees, lumber, and bookshelves, what is this nation's gdp?