This calculation is not right in real world. This is where IDFC has played their word games.
10x RP is eligible only from incremental spends over 20k, meaning you get 10x points in spends which are after 20k.
So the above table is void. Also if your monthly spends is <20k you will never get 10x RP.
I confirmed this with 2 traces of CC payment. One with 10k and one with 21k. The 10k fetches 330pt and 21k fetches 280pt + 660pt (10x only on the spend after 20k total)