Calculated field for If/then statement

I am trying to figure out how to create a percentage paid field that will display the current most paid stage payment. i.e. 

if the client has paid 10% percent only it will display 10 or 10%

If the client has paid 40% and 10% it will display 40 or 40% 

and so on 

I am currently trying to do this with IfElse but am not entirely sure if that is correct

if anyone could help that would be great 

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