Retail Mall - Why 2 lines

Whenever I go to any retail mall in Pune or Bangalore, I am always question eager to know simple question, why is there 2 lines one for billing and one for weighing the vegetables, why can't they do in in billing section itself.

Amount of retail malls that we see in India atleast, time has come for these retail shops to look into difficulties that consumer face, they cannot just dump their products in their shop like BIG BAZAAR do and ask consumer to pick, give them reason to choose other than discounts, arrange products properly, start to think more about your users rather than just giving them discounts