This is a fascinating post from The AAPL Tree, an Apple blog that has moved entirely to Apple News. The linked post mixes a good number of well researched facts about Apple’s India operations with some educated guesses.
If you are interested in Apple and India, don’t miss the crowdsourced revenue/net income chart in the middle of the post. It estimates Apple’s 2017 India revenue at about 11,618 crore. A crore is 10M rupee, about $156,000.
Doing the math (pulls out Pcalc), 11,618 crore is about $1.8 billion. Not too shabby.