@Uncle Jack : I would be intersted in the netto weight
The website says 10 1/4 oz. for the default one:
https://www.campbells.com/product/tomato-soup/
Also, the small letters under the 30 and 40 are important. It could be "Compared to other branch X"...
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Bigger picture here:
The right is 15.2 oz, and it says that it is 30% bigger than 10.75 oz...
"than 10.75oz condensed soup cans"
So ok, misleading... the math does not... match...
# perl -E 'say 10.75*1.30'
13.975
# perl -E 'say 15.2*0.70'
10.64
# perl -E 'say 15.3*0.70'
10.71 <-- too low
# perl -E 'say 15.4*0.70'
10.78 <-- too high
But if you do it like this:
# perl -E 'say 15.4/10.75'
1.43255813953488
Then it is 43% bigger...
the 30 can be obtained by doing the inverse:
# perl -E 'say 10.75/15.4'
0.698051948051948
which is aprox. 0.7, thus 30%
Don't you love "1+ 2 = 4" math? (I can prove that, just visually superimpose 1 over the two, like it was the stick of the 4)