AMOUNT OF GRATUITY IS WORKED BY TAKING THE NUMBER OF DAYS OVER 26 DAYS FOR MONTHLY PAY. IN OTHER WORDS MONTHLY SALARY IS CONSIDERED AS PAID FOR 26 DAYS INSTEAD OF 30/31 DAYS AS THE CASE MAY BE.
15/26 mean.... Basic Salary per month is divided by 26 days (as against 30/31 days...it is just based on working days removing 4 sundays) and the factor is multiplied by 15 days. It is nothing 15 days basic salary is given as gratuity as per Payment of Gratuity Act.,