急求一道经济题!1.SweatersInc.sells sweaters in the US and in Canada.The production of sweaters is describedbelow.All firms are in the US unlessnoted.Yarns Inc.buys wool from the Haslett Sheep Farm for $ 1,000Yarns Inc.spins the wool into yarn.Knitters Co buys yarn from Yarns Inc.for $ 1,500Knitters Co knits 400 sweatersSweaters inc buys 400 sweaters from Knitters Co for $ 6,000Sweaters inc buy 400 boxes from The Box co.of Costa Rica $ 1,200Sweaters Inc.marke

急求一道经济题!
1.SweatersInc.sells sweaters in the US and in Canada.The production of sweaters is describedbelow.All firms are in the US unlessnoted.
Yarns Inc.buys wool from the Haslett Sheep Farm for $ 1,000
Yarns Inc.spins the wool into yarn.
Knitters Co buys yarn from Yarns Inc.for $ 1,500
Knitters Co knits 400 sweaters
Sweaters inc buys 400 sweaters from Knitters Co for $ 6,000
Sweaters inc buy 400 boxes from The Box co.of Costa Rica $ 1,200
Sweaters Inc.markets and sells the 400 sweaters
US buyers buy 300 sweaters for $40 each $12,000
Canadian buyers buy 100 sweaters for $40 each $ 4,000
How muchdoes the production of sweaters sold by Sweaters Inc.add to the U.S.GDP?