Calculate Tax on Mutual Fund(SIP)

Shubham Patel (student) (80 Points)

04 December 2021  
I have investment in mutual fund through sip(Rs.500) monthly. I redeem x (not all) unit of mutual fund. it is long term gain. I have to determine purchase price of units which i have redeem. how can i determine purchase price for the mutual fund units that i have redeem inorder to calculate tax??