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send file by mail erorr

I want whene i add number get  amount automatically after discount.....like
whene i add 100$ at 200$ automatically multiplication 15%
whene i add 200$ at 300$ automatically multiplication 20%
and whene i add 300$ at 400$ automatically multiplication  25%...

like that code  i think:

procedure Form1_Button1_OnClick (Sender: string; var Cancel: boolean);
begin

    Calculate
    if Edit1:=integer :=100 at 200 then
    100 at 200  * 15/100
    if Edit1:=integer:=200 at 300 then
    200 at 300 * 20 /100
   if Edit1:=integer:=200 at 300 then
    300 at 400 *25/100

end;

begin

How to calculate the dates

need make for us software pso system working by handbarcode .
dislapy login system
display total item added
display total price
dispaly report all and by click .

if you cant make it please learn us what we need to make pos system

need script to send pdf report to email like gmail.

im installed new version 1.52 whene i open sample My Visual DataBase and click Run i get this error in photo please look

help me i want know in TableGrid show me wich data add user and i want know one user how many data add couse i ahve group add data but i want know wich user is working good and add data alot of than other people....etc