also they use a very dangerous formula to calculate the brokerage they calculate .5% of the total amount and then add this amount to the each share you traded so that the actual brokerage increases more that .5%.(this formula is generally used with lifetime 555 accounts)
1. If you buy/sell 1000 shares of FSL @ Rs. 30 per share, then your brokerage will be calculated as :
a)1000 (No. of shares) x 0.05 (brokerage) = Rs.50/-
b) 0.05% (brokerage) of Rs. 30,000 (Total Amount) = Rs.15/-
As the former is higher, It will be charged.
2 If you buy/sell 50 shares of Reliance @ Rs.2000 per share, then your brokerage will be :
a) 50 (No. of shares) x 0.05 (brokerage) = Rs.2.50/-
b) 0.05% (brokerage) of Rs.1,00,000 (Total Amount) = Rs.50/-
As the later is higher, It will be charged
Hope this clears the suspicion on brokerage