extjs - Calculate the grid column value with total value in extjs4.1 -

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i have grid 2 columns: target , target percentage. getting target value store. need calculate total , target percentage value using jan/total jan*100. want summary target %. can tell me how this?

i need calculate total manually

e.g 

month  target      target %    jan     50       **50/100*100**    mon     50       50/100*100    total   100

thanks

probably want in model.

{     name : 'target %',     convert : function( value, record ) {                    var target = (record.get('target')/total)*100;                    return target;     }        type: 'number' },

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