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added or multiplied? you mean you can have any number of columns rather than just two?


awk '{p=$1;for(i=2;i<=NF;i++)p*=$i;printf("%.3f\n",p)}'


example:

$ echo 3 .5 2 | awk...

so, you already try in awk, why not write all by awk?

awk '{printf "%.3f\n", $1*$2}' infile