Compute capital gain tax for sale of residential flat?

Purchase price Rs. 5,51,780/- date August 2002.
Selling price Rs. 11,50,000/- date February 2008.
Also how do I make the tax payment to the income tax department if I want to deposit the tax amount in SBI by filling a challan? What will be the challan no.?
Can LT capital gain tax be paid without indexation at 10% rate if it is less than tax computed with indexation at 20%?