@Kongara Brokerage is Rs.20 per order for men and Rs.10 per order for women with Dhan. Exchange, SEBI, Govt all charge extra per trade in % of trade value. Broker cannot do anything about the latter.
Also u can see all the charges in the order window before order placement using transaction estimator. After order execution if you want to see the charges (brokerage and other charges shown separately) u can do so in [Trader’s diary] (Introducing: Trader's Diary on Dhan) from the next day onwards. You can also find the same with more granularity in the contract note sent to your mail everyday after market is closed.