Vivek Express: ऊंचे नीचे रास्ते और मंज़िल तेरी दूर.

Hi Guys.
I have just now booked a ticket in 12009 shatabdi for a senior citizen female from mumbai to ahmedabad
I have been charged Rs 835 after applying senior citizen femal concession , but i guess fare should have been Rs 670
I guess dynamic fare has been charged as at the time of booking it flashed Rs 319 as dynamic fare
Just...
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wanted to know is dynamic fare started on 12009 shatabdi exp also?
Also what is the calculation for the same as on ticket there is no description
On ticket It states as below:
Ticket fare- 590
Carering charge 245
Total 835
Are catering charges really Rs 245?
Thanks