How can I work out my University grade so far?

I am currently awaiting my final University mark, which comes out on Wednesday. My second year was worth 40% of my overall grade and I achieved 71.2%. Can someone help me work out what I need to have achieved in my third year (which is of course worth 60%) to have achieved a first (70% or above).
Clearly my degree was not in Mathematics!
I hope this makes sense...
 
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