so what i'm gonna do is find out how to get about 42 oz by multiplying 10.57,
10.57 x 4 is the closest i got with 10.57 x 4 = 42.28
then i multiplyed 3.48 by 4 to see the price of 4 bags
which was 13.92
so the 42 oz one has the best deal
hope this helps!