Indian Railway Catering & Tourism Corporation [IRCTC] — Ticket fare

Address: 768001

Website: www.irctc.co.in

I want to know the reason that if you have written that you will take Rs. 10.00 + ST of Rs. 1.50 for every transaction (booking a ticket) on your IRCTC website, then why you are deducting Rs. 23.00 (Rs. 20.00 + service tax of Rs. 3.00) instead of Rs.10 + Service tax of Rs. 1.50 for a single transaction (i.e. when I am booking a single ticket, it costs me Rs. 23).