How to show totals in legend for chart in SSRS 2012

I would like to include Grand Total in  the chart legend. Legend  should look like this:

Category 1  $10
Category2   $20

Total $30

I would appreciate your help.
Thank you
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SThayaTechnical MAnagerCommented:
Hi ,

 do the below steps
1. Right Click the series  and select Series properties
2. Go to the Legend tab
3. In the Custom Legend Text  section .click the expression  "fx" button and write the below expression

= "$" & CStr(Sum(Fields!Category 1.Value)+Sum(Fields!Category 2.Value))

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