Is there a brokerage fee of Rs.21 On every trade Or What happens if my brokerage per brokerage% slab or minimum brokerage slab is lower than Rs. 21.

If actual brokerage is considered to be less than Rs. 21, and Rs. 21 is taken as greater than 2.5% of traded order value thencharge will be 2.5%  brokerage.

Order No	Qty	Rate	Amount	Brokerage Slab(existing) Brokerage* Minimum Brokerage 17.7 4	Order level Brokerage(Min) 2.5% Brokerage Minimum 75 21	TotalBrokerage
xxxxx	100	30	3000			21