I don't know why the prices are so different - just that they are.
Example of how 50K INR does not equal USD$1000
Lenovo Ideapad Y Series Y570 15" notebook. Lenovo Ideapad Y Series Y570 Rs. 58335 (1054.49 USD)
Core i7 2630QM CPU, 6GB RAM, 1TB 5400rpm HDD, DVD drive, 1GB NVIDIA GT 550 graphicsNVIDIA N12P-GT Optimus = GT 550 graphics card Lenovo Ideapad Y Series Y570 $700 (38724.09 INR)
Core i7 2670QM 2.2Ghz CPU , 8GB RAM, 500GB 7200rpm HDD, DVD drive, 1GB NVIDIA GT 555 graphics