How to sell under construction property

Hi

I want to sell under construction property which I bought at 3000 /sqft.
Now the property rate is at 5000 /sqft. and the project has been launched. I've paid 50% of the total amount at the original price. I've not taken any loan and the property is not registered yet.

If I sell this property then, what amount will buyer give me? This would be the:

1. 50% of total cost at 5000/sqft

OR

1. 50% of the total cost at 3000/sqft + profit on another 50% remaining amount

Please explain.

Thanks in advance.