STT for equity is 0.1%. Looks like you have sold stocks worth 50k in 2trades.. So brok is 40 and STT is 50( 0.1% of Rs 50,000).. This is very normal with us, we recently had a guy who sold around 3crs of Stock portfolio in 6 trades, paid Rs 120 as brokerage and Rs 30,000 as STT..