Question and attempt in attachments.
You're making a mess by mixing mA with A. Stick to consistent units & you'll be OK.
In your determination of V2 you haven't specified where the "0.6" comes from. If it's from figuring the current through R4 then make sure you've accounted for the units used.
EDIT: Scooped by rude_man!
As he was by you, several times!
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