Look at this as a market-sizing and brand-protection problem rather than a straight profit calculation. Nagar has 10 million people: 2 million rich, 5 million middle class and 3 million poor. The rich segment is already close to saturated, since its growth has slowed, so the real opportunity for more profit sits in the 8 million people in the middle and poor classes who currently cannot afford the brand.
The option that actually works with the numbers is to keep the premium brand exactly as it is for the 2 million rich customers, and build separate, lower-quality product lines under new brand names for the middle class and for the poor class. That way the company adds up to 8 million potential new customers at prices they can pay, without touching the pricing or image of its existing premium line.
Let's summarize:
So the best option is to sell similar products of different quality, under different brand names, to the middle and poor classes, which is option 3.