I corrected that in next post. $200 millions of duty increase on $6 Billion worth of goods is like 3% price hike if you average out. You wont even notice it in your bill, that is when price stays same, if exporters take a hit of 1% and government subsidize 2% ($125 millions) the increase in price will be zero.
3% increase is not big enough margin for local producers for import substitution, forget it's reflection on GDP of either countries, Indian GDP is almost 3 trillion, US is reaching 20 trillions, 200 millions is less than margin of error. I am being so dismissive of it because it's too small for any impact anywhere at all but it does take away a big carrot from US hands, they were already struggling for any leverage, giving up low impact high decibel GSP will reduce it further in trade negotiations.