At what unit size (i assume Large)? I don't Rome:TW with me here, but when i get home i will double check those numbers.
Even if you substract 2.8 from the first value 5.6, you're still left with 2.8, which should be rounded to 5. If you then argue that all numbers get rounded down anyway, then -0.7% is already enough to account for your data. Why 2.8%???
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