-These are hot drinks for one morning and one night.
-You should adjust for the number of coffee drinkers.
-If you use ground (real) coffee beans, 1 lb. of ground coffee makes ~48 cups of 6 oz cups of coffee (or ~24 cups of 12 oz mugs of coffee)
-One mug of hot chocolate is ~32 grams of powder, so 400 grams (454 grams = 1 lb.) is enough for 12 people to each have one mug, either in the AM or PM but not both.