• 26QB form for jointly owned property

Hi,
Background: I have purchased a new flat (In Construction Phase) from a Real Estate Corporate. It is in joint Ownership with my wife. So, 2 Buyers and 1 Seller.
Agreement of Sale does not mention any Specific Contribution share; However, we are considering it 50-50. 
Sale of Consideration (Property Value):1 Crore
2 Buyers and 1 Seller
Current Installment value credited to the Seller by us is: 20 Lakh. So, total applicable TDS is 2Lakh (Between both of us)
I understand that we have to create 2 numbers of 26QB (One for me and one for my Wife) and each of us to pay 1 Lakh Rs as TDS (So total TDS: 2L). My Question is about two specific fields of the online 26QB form:

1, What value needs to be filled in EACH OF THESE 2 FORMS under "Total Value of Consideration (Property Value)" - 50Lakhs or 1 Crore?

2. What value needs to be filled in EACH OF THESE 2 FORMS under Current Installment Value which is "Amount paid/credited currently (B)" - 10 Lakh or 20 Lakh?

3. Outside the Purview of the earlier 2 questions, I have one clarification: While we have considered the contribution 50-50 here, can we work out any other contributions (Say 70-30) as there is no specific mention of contribution in the Agreement.

It would be really helpful if you could respond to the above queries.
 
Best Regards,