Convert from drachme to mercantile pound

Unit Definition (drachme)
The drachme is a traditional unit of weight in France and Germany, generally between 3.7 and 3.9 grams.

Unit Definition (mercantile pound)
The mercantile pound is a historic English unit of weight, the mercantile pound (libra mercatoria) was the commercial predecessor of the avoirdupois pound. Used from about 1100 to 1300, the mercantile pound contained 15 troy ounces or 7200 grains. This is equivalent to about 1.0286 avoirdupois pounds or 466.55 grams.