How much ground meat do I need for 80 people? To make tacos or nachos for 80 people. How much ground meat will I need to use?

Well when it is me and my hubby 1lb for the two of us works. He is a meat and cheese only guy if that helps. I would calculate how many children, men and women are there... We sometimes have enough left for two soft tacos so I would estimate 1lb for 2 people and possibly a child...