Adding a Computed column at end for a growing list using Fn-No macros

Hi,
No Macros
I am facing a issue to add a computed column at the end of the 1st column ,Total (i.e) calculated separately.The Student list might increase in future .
Pls. Go through the attachment and help me out to achieve with help of function!
can you help me out to Paste the total at the end of last student name.
Thanks in advance.

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