[debono]

I am not sure but I think to maintain 100% weight accuracy could be problematic as weight of fresh products on the shelves should become lesser  as they dry up during the display period. I dunno what is the market standard but think an allowance for weight variation should be considered............

Taking into consideration that the pasted wt. may be heavier than the actual wt. the difference will not be so large....In the petrol stations practice, the amount of petrol in the tanker is given a 1% as evaporation loss.......