I trade USDINR, the margins would depend on your trading. I have accounts with VNS and Angel, VNS gives 2 times
margins for intraday(futures) and 1 time for position trades. For USDINR todays margins are Rs 800/- for intraday, and
approx 1600/-for positions, per lot. Margins are subject to changes and depend on brokers too.
When trading, for every one paisa movement or four tick the amount is Rs 10/-, or Rs 2.50 per tick.
eg.; USDINR buy 54.20, Sell 54.25, gain 5 paisa, gross profit is 5x10 =Rs 50/- per Lot.
I hope this is clear and helps.