How to find running total

Table1
AccountNo Amount
1 .............500
1 .............500
1 .............500
how can we show running total in report for example if we fetch data from above table named table1 result should be look like in report as
AccountNo Amount.......Total
1 .............500 ...........500
1 .............500 ...........1000
1 .............500 ...........1500

plz help me how can i do it

Well, if you are using Crystal Reports you would just create and display a "Running Total" field object.