Stuck on Ghaziabad flat costs, need clarity

Is anyone clear on the *actual* final cost for a 2BHK in Indirapuram? Kids moved out, selling our big house for something manageable, near a good hospital. I'm looking at AGARWAL ASSOCIATES, prices around ₹75-80 lakh. But phir stamp duty, registration, PLC, parking... kitna extra ho jaata hai total? Builder quotes one price, par hidden charges se darr lagta hai. How to get a clear all-in cost? Also, this super area vs carpet area trap is confusing. Brochure numbers seem inflated. How do we ensure paying for actual usable space? My budget is tight. Any advice on these points?