Amul / Gcmmf — prices of amul milk and butter milk are charged rs. 1 extra upon mrp

Hi,

I am residing in nalasopara (Mumbai). It is seen that anywhere you buy a packet of amul milk or butter milk, the shop keeper charges 1 rs extra on the mrp. When asked about the extra charges, they say that they do not earn anything on the mrp so they charge rs. 1 extra per packet. For ex: 1 pkt of amul butter milk is of mrp rs. 11, but they charge rs 12 from the consumer. I don't know how can they charge above the mrp. Kindly look into this major as this is the major concern. As retail shopkeeper sells about 100-200 pkts of milk and buttermilk.