Trading in mini nifty

#1
Hi,
I am new to the fno. I would like to start trading fno with trading in mini nifty.
I would like to know how much margin would be required to trade 1 lot of minifty.
Whether you require the margin for both legs of transaction i.e say 15% for buying and 15 % for selling. Or just the single margin of say 15% would be sufficient for both?
 

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