Answer:
Anywhere from 50 Cents to 5 dollars depending on the people who are actually drinking the wine out of that prediction. You can't always count on people drinking it. So unless it DEFINITIVELY tells you how many people are going to buy the glasses of wine. There is no real way to estimate an exact total. So to be safe I would stick around $2 or $3 per guest
Explanation:
9 Liters is around 304 Ounces in total
So each guest will have around 2 glasses which are 5 ounces.
So 10 for each in total.
350 x 10 = 3500 Ounces
Since each case holds 9 liters of wine; it holds around 2736 ounces.
So if 350 are having 10 ounces of wine. That's 3500 Ounces.
So 2 cases of wine would be fine.
120.00 per case and since we decided that 2 cases are fine. We can say it will cost them $240.00 to make sure everything is met. (Assuming they can't buy less than a case.)
So, 2 cases...350 people.
So for each guest, assuming that all the 350 people are going to have 2 glasses. It could cost anywhere from 50 Cents to 5 Dollars depending on if they want to make a profit.
So this is NOT a definite answer but its close.
Not sure if there are options but if so it just depends on what they are looking for.