What would be the area ratio to the plot size?

Q: My concerned are as follows, in Surya Nagar Colony Phase 1 and Phase 2 Faridabad:-
1 - Is the second floor is legal?
2 - If yes then what should be the area of second floor as compared to the ground floor or first floor ?
As per the dealer and builder by mcf faridabad construction law
0 floor = 60% of the plot area
1 floor = 60% of the plot area
2 floor = 30% of the plot area
which is in total = 150 %
And the above are divided by the builder as :
0 floor = 50% of the plot area
0 floor = 50% of the plot area
2 floor = 50% of the plot area
which is also equal to 150% and they are saying it is legal.

So if in this case if I am buying second floor, would it be genuine or the HUDA will demolish my second floor.