in the no specialization-no trade case, suppose country x produces and consumes 100 units of good a and 20 units of good b. country y produces and consumes 20 units of good a and 60 units of good b. if the two countries specialize and trade, and the actual amounts traded are 125 units of good a for 25 units of good b, how many more units of good a will country y consume by specializing and trading?