You really need to appreciate Mr. Narayan for the quick posting. However, following up with the posting, I need to quickly fill up something that was omitted from his side.
Gratuity Eligibility
To earn gratuity, any employee should have completed five years of continuous service in a company. Follow this link for the Gratuity Act 1972:
http://indiacode.nic.in/fullact1.asp?tfnm=197239
Gratuity Calculation
Gratuity is a certain sum of money that is received by an employee, and the last drawn salary is used for calculating the money payable as per the formula: Calculated as (Basic + D.A) x 15 / 26 or 30 x No. of years in service (above 5 years).