I'm desperate, My community is having an event this Saturday, we are cooking corned beef for 90 people I did a research about how many pounds of corned beef to buy, but what I don't know is if the amounts they suggest was before cooking or after cooking it, so far we first bought 46 lb, and from those we got 12lbs of corned beef!! we went back and bought another 25 lbs and we got 7lbs I'm scared!! how many pounds do I really need to buy to feed 90 people then? please help!!