Kunal says 8 lakh and 80 lakh are both counted in 'lakh', so they are roughly similar-sized big…

Why

Kunal's feeling comes from how the two numbers are SPOKEN — 'lakh' shows up as the unit word in both, and hearing the same unit can make numbers feel like they belong to the same rough size, the way '8 rupees' and '80 rupees' might both just register as 'a bit of money' if you're not paying close attention. Write the actual numbers out, though: 8 lakh is 8,00,000, and 80 lakh is 80,00,000 — the second has an entire extra digit, because 80 lakh is exactly 10 times 8 lakh, not a similar amount. The unit word 'lakh' only tells you WHAT is being counted in lakhs, not HOW MANY lakhs, and that count is exactly what determines the real size. Test: 8 lakh rupees would buy a modest car; 80 lakh rupees could buy a very comfortable house — a tenfold difference lived out in the real world, not a rounding-error-sized one. No, 80 lakh is 10 times 8 lakh: sharing a unit word doesn't mean two numbers are close in size, and moving from 8 to 80 is a full order of magnitude, not a small step.