Bash - Math: Returns integer instead of float

try something like this

$ echo "21/5" | bc -l
4.20000000000000000000

$ echo "$y * ($num_lines/$w)" |bc -l
37.80000000000000000000

For setting up limit of decimal point use like below, For 2 decimal point

 $echo "scale=2; $y * ($num_lines/$w)" | bc -l
 37.80

For 3 decimal point, just change the scale number.

$ echo "scale=3; $y * ($num_lines/$w)" | bc -l
37.800

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