Help with cash back math (IDFC debit card vs HDFC debit card)

[harisund]

I am looking to compare HDFC's platinum DC and IDFC first wealth (https://www.firstrewards.com/user/earn)

HDFC = 1% up to Rs. 750
IDFC First Wealth =
4x points for Rs. 150 upto Rs. 50,000
10x points for Rs. 100 above Rs. 50,000
1 Reward Points = ₹0.25
Redemption fee of Rs. 99

I want to know if my understanding is correct

I am plugging the formula below on wolfram alpha (link here) and I get 67, 711

(x/100) = (0.25) ( (50000 * (4/150)) + ((x-50000) * (1/10))) - 99

Does it mean if my credit card bills are more than Rs. 67, 711, I am better off paying the entire amount with my IDFC debit card than using the HDFC debit card at all, or is there some other catch?

People who have both debit cards, how do you choose which debit card to pay CC bills?

 

[sousnake]

I am looking to compare HDFC's platinum DC and IDFC first wealth (https://www.firstrewards.com/user/earn)

HDFC = 1% up to Rs. 750
IDFC First Wealth =
4x points for Rs. 150 upto Rs. 50,000
10x points for Rs. 100 above Rs. 50,000
1 Reward Points = ₹0.25
Redemption fee of Rs. 99

I want to know if my understanding is correct

I am plugging the formula below on wolfram alpha (link here) and I get 67, 711

(x/100) = (0.25) ( (50000 * (4/150)) + ((x-50000) * (1/10))) - 99

Does it mean if my credit card bills are more than Rs. 67, 711, I am better off paying the entire amount with my IDFC debit card than using the HDFC debit card at all, or is there some other catch?

People who have both debit cards, how do you choose which debit card to pay CC bills?

Are you sure about points above 50k - shouldn't it be 10 points per 150 rather than 10 points per 100.

 

[harisund]

Are you sure about points above 50k - shouldn't it be 10 points per 150 rather than 10 points per 100.

FIRST Rewards

www.firstrewards.com

Bottom left says -

10X reward points for every Rs. 150 spent via debit card on incremental monthly spends above Rs. 50,000 in a month
Applicable for monthly spends above Rs. 50,000 for FIRST Select on every Rs. 100, above Rs. 50,000 for FIRST Wealth on every Rs. 100 and above Rs. 50,000 for FIRST Private on every Rs. 100 (w.e.f. 1st December 2023).

The top line says -- 10X reward points for every Rs. 150
But then it also says - above Rs. 50,000 for FIRST Wealth on every Rs. 100

So I am not sure?

 

[AlgoTrader]

i

FIRST Rewards

www.firstrewards.com

Bottom left says -



The top line says -- 10X reward points for every Rs. 150
But then it also says - above Rs. 50,000 for FIRST Wealth on every Rs. 100

So I am not sure?

i am in same confusion,