Well, you first have to make the mixed fraction into an improper fraction. You then multiply the two fractions and ad the whole number into the total.
That's how i was taught back in the 4th grade... i'm not sure if it's correct but i hope it is-
12 oz for 2.68 = .22 per unit
16 oz for 2.49 = .16 per unit
the 16 oz for 2.49 is your better deal
This isn’t a question this is just a statement