capital gain query

Vinay Gupta (271 Points)

30 July 2017  
my grandfather purchased house for rs. 12000 in 1970. they construct 1story and spend money around 80000rs then we again registered it in 1990 for rs. 100000. After this we repair many time in our home. now my grandfather is not no more and home transfer to my father and 2 brothers. now we selling this property in 2017 for around 1000000/-.
then how we calculate capital gain on it.
please guide
thank you