Setting width as a percentage using jQuery -

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How can I determine the width of a div as a percentage by using jQuery?

Function usage: 

  $ ('div # somediv' ) Width ('70% ');

will be turned on: 

  & lt; Div id = "somediv" />

In: 

  & lt; Div id = "somediv" style = "width: 70%;" />

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