Sum of 2 fields in repeater

Question

Hi

  I have 3 fields in a repeater Id,Received,Issued.

In another column i want to display Value as Received-Issued. In the end of repeater i want to display Total like below

Id              Received               Issued             Balance

1                10                           4                          6

2                   5                            2                         3

Total           15                          6                          9

Thanks