While computing exemption in respect of gratuity received by a non-Government employee covered by the Payment of Gratuity Act, one of the items to be considered for computing the maximum amount of exemption is 15 days salary × years of service. In this case, 15 days salary is to be computed bydividing the monthly salary by _________ days. 

The formula for calculating gratuity for non-government employees covered by the Payment of Gratuity Act is: Gratuity = 15 * Last drawn salary * Number of years of service / 26 Where, Last drawn salary is the average salary of the employee for the last 12 months of service. Number of years of service is the total number of years of service with the employer. 26 is the number of days in a month.  Therefore, 15 days salary is to be computed by dividing the monthly salary by 26.