Capital gain calculation

I purchased a house in March 2005 for Rs. 475000. (Rs. 70000 extra towards stamp paper for registration) I invested Rs. 250000 for its repairs in 2007-2008. I sold it for Rs. 1500000 in Jan. 2010.

How much capital gain I have to pay. Am I required to show some document to prove cost of repair. I have taken no loan for repair. Can I save if I purchase some capital gain bonds.