The National Council of Applied Economic Research has released numbers about the number of Indian households at different income levels, for 2001 and 2010. I couldn't find the paper online with a quick search, but there's a story here. (The headline is a bit polemical, but whatever)
I tabulated the numbers:
|Number of Households (millions)|
Low income is defined as being under 45k INR p.a. (~1k USD today, nominal), while "high" income is 180k INR/~4k USD, where all numbers are at 2001 prices. I don't know if household composition changed any over the past ten years, but I imagine it isn't a huge effect.
Sounds to me like the optimistic narrative re Indian economic growth isn't that far off...