in itr 2 in section of long term capital gains for shares bought before 31st jan 2018, how do i show multiple sale values of a company, e,g say i sell tata steel 10 shares at 900,5 at 930 and 25 at 915, in the contract notes , the brokerage is all together so how do i find out how much brokerage as charged for each ? also incase the shares r very old and cost of acquisition is not available with me then at to fill there?