How to collect repairing fund if all flats Carpet Area Different

I am staying in Mumbai Kandivali. We had 3 wings A,& B wings ground +3 upper floors. (2 Room Kitchen flat) &y C wing ground + 4 upper floor (1 Room kitchen flat 13 Nos) (1 Flat terrrace flat 2 room kitchem + small Terrace attachec with flat) A, B wing average carpet area per flat is 450 sq.feet. 24 flats. C wing containing 13 flats carpet area 310 sq feet. 1 flat terrage flat carpet area 600 sq.feet Another 2 flat in AB containing carpet Area of 275 sq.feet. How we should collect repairing fund? Terrace area of AB is big & C wing small. Please guide. Big flat holders says 1) Terrace repairing of ABC equal expences divide to 39 members. 2).Ground Repairing work equal expences divide to 39 members 3). Side Wall of compound equal expences divide to 39 members. Total 25 members holding Big flats (2 Room kitchen) Total 14 Members holding 14 Flats. (1 Room kitchen) When question comes for majority of members then small flats are less & they cant prove majority. Please guide about how to calculate repairing fund. If small flat holder is getting injustice then whos govt authority Protect small flat holders. Jayesh Vasa. [deleted]. Email: [deleted]