Color xls using the perl on debian machine using the text commands

I have a xls sheet and I want to color it.

For example I am attaching a color.xls sheet here.
This sheet contains 3 coloumns now what I need that the no "35 " should be colored by red no "45" by yellow and no "20" by blue blue.

A perl script that can do all this things

I have little idea like:
#!/usr/bin/perl
 
open (FILE, 'color.xls');
while (<FILE>) {
chomp;

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