Ballard Company uses the perpetual inventory system. The company purchased $9,700 of merchandise from Andes Company under the terms 3/10, net/30. Ballard paid for the merchandise within 10 days and also paid $420 freight to obtain the goods under terms FOB shipping point. All of the merchandise purchased was sold for $18,400 cash. The amount of gross margin for this merchandise is:

Hours to produce one unit worker hours to produce yarn country a 8 hours country b 4 hours worker hours to produce fabric counrty a 12 hours country b 13 hours additional worker hours to produce fabric instead of yarn country a ? country b? which of the follow is true of the trade relationship between country a and country b? country a has an absolute advantage in producing yarn and fabric country b has an absolute advantage in producing yarn and fabric country b has a comparative advantage to country a in producing fabric country a has a comparative advantage to country b in producing fabric