SUM of Two Columns (HELP) CRYSTAL REPORT in VB.NET

My table name is "accounting"

it has two columns named "Debit" and "Credit"

Is it possible to have the sum of these two columns?

example

Code:

---

          INPUT:                     
Debit              Credit                   
  200        +      -100     
  300        +      -300 
  500        +      -400     
--------          ----------                 
 1000              -800

---

I want it to appear like this in my Crystal Report:

Code:

---

Debit              Credit              TOTAL                   
  200              -100                100
  300              -300                0
  500              -400                100
--------          ----------          ---------       
 1000              -800                200

---

I dont know what FORMULA I should use in Crystal Report

sum({table.field}) should give you the sum of each data column. for the values in the total column you should be able to use a formula like {table.debit}+{table.credit}