box spread arbitrage

Hello evrybody, I Sold the box spread of Unitech today with the stike price of 80 and 85. and received the net premium of 5.60 and underlying value is 75. My trade: Sell 80 Call @ 5.35 Buy 80 Put @ 8.05 Buy 85 Call @ 3.15 Sell 85 Put @ 11.45 So net credit is 5.60 and...