It is not possible for us to tell you what is the justification for unfavourable formula used by the Government for paying gratuity to government employees vis-à-vis private sector employees, etc. It is a policy decision of the Parliament / Government, which may perhaps have been taken based on various factors (including various other benefits of a government service). You may ask the Government to explain the justification for such discrimination.
Legally speaking, reasonable classification is permissible under Article 14 of the Constitution which guarantees right to equality.
However, if you feel aggrieved, you can try challenging such discrimination in the high court by filing a writ petition, though the chances of success would be limited.
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