Not quite correct.
For AC classes, it is 10 per cent of the available seats to be earmarked for Tatkal
For Sleeper Class, it is 30 per cent of the total available seats in that class and train.
I may be corrected please by referring me to a circular of the railways. This is as far as I remember the allocation of Tatkal seats...
more... as inthe previous year.
Good wishes.