brokerage options

i am new to options. so far i did options trading 2 times . what i don't get is ,when i checked my back office at 5:30, my selling average shows Rs.1 less on my selling avg on both the trades. i am with angel broking. .would any one be kind enough to explain it to me. thanks in advance

On what amount is the Brokerage charged in case of Options? A Sample transaction would be good..