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[...]

...
        push @data, [ @row ];
    }
}

for ($i=0 ; $i < $lines; $i++)
{
...
}

QP 2/27/2008 555 1000.00   2493819320

1) Generate the sum of element 3 where element 1 reoccurs in the array
+. I.e., tally the day's sales.
2. Print out a line with the sum of the day's sales.
3. Print the row with each individual sale, with element 3 made negati
+ve.

for ($i=0 ; $i < $lines; $i++)
...
                
}