big save?

im just surprised at what i encountered earlier in the day. i was in NTUC supermarket. wanted to buy a Magnolia orange juice of a litre and i checked that its 1.73. a tag somehow caught my eyes which it states that the same 1 litre of 2 cost 3.25, amusingly to celebrate errr how many years heh of independence ..... 40 heh? ok, tats not the point. the thing im trying to say is tat .... simple calculations :

buy 2 packets @ 3.25

simple calculation : 1.73 * 2 = 3.46

simple calculation :3.46 - 3.25 = 0.21

is tat worth the cents saved or not ?

watever.