So within 2 to 3 years this company generating a profit in excess of half a billion so that the price should reach Rs5/- which means a lucrative medium term investment for you.
I do not agree with this

I need to know remaining impairment amounts they have to consider in next accounts.
If their impairment burden is mostly gone by now then the story will be much brighter in future.
If no impairments their Earnings per Share was about 83 cents without tax for 2015/16 Y/Y .
Hence my targets go to much upper ranges and it should reach 5 more fast. (low impairment assumed)