That's really interesting. I did not know that India used commas for numbers like that, 3 digits and then 2 digits, and then apparently 2 digits again?
I am a European, so may be wrong, but it is my understanding that Indians have intuition around lakhs (100k) instead of thousands/millions. Apparently 100 lakhs is a crore (10M), but I haven’t seen that used so don’t know how prevalent it is - lakh is very commonly used though.
3,00,00,000 instead of 30,000,000