How do I determine the last deal and the deal before it؟

[khalids222]

How do I determine the last deal and the deal before it
Example
i have
1- buy opened = 50
2-buy opened = 40
3-buy opened = 30
4-buy opened =20
the price now arrive to 26
At this point, I want to close the last deal no (4 (buy opened 20)& 3(buy opened 30)) , and the deal before it when the sum becomes =1 one

[l'andorrà]

@khalids222 You can find them it this way:

[khalids222]

@l-andorrà Thank you very much, but what is the correct way for that?
I think both methods are incorrect