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How to calculate the result of fee?

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How to calculate the result of fee?
I use PHP and MySQL create the program to retrieve data from the table of grants in webpage:

The table with the data of all grants, I want to calculate the result of the used grant by subtracting the amount of expanses each time used. for example:


Balance

50000

400

6000

300

------------------

result $43300

Please help me get the way to retrieve the result each time submitted. Thank you!
Subject Author Views Date
Thread How to calculate the result of fee? xiaofei 9269 May 7, 2003, 7:08 PM
Post Re: [xiaofei] How to calculate the result of fee?
Andy 8926 May 8, 2003, 2:05 AM
Thread Re: [xiaofei] How to calculate the result of fee?
xiaofei 8737 May 8, 2003, 4:41 PM
Post Re: [xiaofei] How to calculate the result of fee?
xiaofei 8525 Jul 24, 2003, 2:15 PM
Thread Re: [xiaofei] How to calculate the result of fee?
xiaofei 8518 Jul 26, 2003, 5:21 PM
Post Re: [xiaofei] How to calculate the result of fee?
Stealth 8493 Jul 27, 2003, 5:20 PM