Property purchase value acquired before 2001

Hi

We have sold a property acquired before 2001. The sale deed shows Undivided share of land as 300 sqft and flat as 800 sqft. Per sqft value as per registrar is INR 1410 per sq ft. Now for the cost of acquisition do i consider (800 Sqft + 300Sq ft ) INR 1410 or only 800 Sqft  INR 1410.

Anyone who knows the method please explain.

Thanks