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$ echo 'abcp 10p 0.52p' | sed 's/\([0-9.][0-9.]*\)p/\1/g'
abcp 10 0.52

#!/usr/bin/ksh
# INFILE should exists
INFILE=tst

# WORKFILE contains the same entries than INFILE
# but reordered so that brand having the most entries appear first in the file
WORKFILE=tst.w...

You should consider adding a non ambiguous separator between the Brand and the product (for example like colon ":" to follow POSIX standard)
Indeed, that would gather the advantages of

1)...

Could you change as below and try..
awk '/Filippo Berio/{print $0 FS $2;next}1' inputfile > outfile

sed -r -e 's/(^[0-9])Kg/\1.0Kg/' -e 's/(^[0-9]{1})g$/0.00\1Kg/' -e 's/(^[0-9]{2})g$/0.0\1Kg/' -e 's/(^[0-9]{3})g$/0.\1Kg/'

awk '/Kg/ {printf "%.1fKg\n", $1;next} {printf "%.3fKg\n", $1/1000}' infile

0.250Kg
0.500Kg
0.750Kg
1.0Kg
1.2Kg
0.030Kg
0.375Kg
0.500Kg
0.030Kg

$ cat infile
24x18g
12x18g
300g
24x18Kg
12x18Kg
300Kg

$ awk -Fx '{t=$0;gsub(/[0-9x]/,"",t);$0=($1*($2?int($2):1)) t}1' infile

432g
216g
300g
432Kg
216Kg
300Kg

sed 's/.*pack - //'
or awk:
awk '{print $NF}'

Given the lines in your original post, the following should work:
sed 'y/x/*/; s/g$//' file | bc | sed 's/$/g/'

Regards,
Alister

AWK:
echo "24x18g
12x18g
300g" |awk -F"x" '{print NF==1?$0:$1*gensub("g","",1,$2)"g"}'
432g
216g
300g

echo "24x18g
12x18g
300g" | awk -Fx '{$0=($1*($2?int($2):1))"g"}1'
432g
216g
300g