Champagne is an expensive luxury, even the cheapest bottles (of sparkling wine) are still around $4 and that only gets you 750ml. What if you need to put on a wedding? Do you know how many bottles of Passion Pop that is?!
(a*b)/c = d
a = no. of guests at wedding = 140 (CNN Library, 2013)
b = millitres of Champagne per glass = 150 (Australian Government, 2010)