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No-one here can answer that question. India does not have formal Apple stores, only Authorised stores, all of which are privately owned.
There is nothing to stop you going to any one of them and trying to negotiate a deal but the prices are not comparable as they are in the west. You pay the price asked.
Question: I’m from Bangalore , I currently have iPhone 6 (16gb) and I want to upgrade it to iphone 6s or iPhone 7 , May I know what will be price if I give my iPhone 6 (16gb )