Annual Earned Leaves Calculation

Dear sir,
I am working as a senior officer hr in registered company. I want to how many earned leaves are credited in an annual year and how many days are credited for one month.i.e earned leave /days in a month.
I my company we are giving 2.5 days el per month total 30 days per year. So please give clarification for above ones.
Regs
Krishna

DEAR KRISHNA,
EVERY WORKER WHO HAS WORKED FOR A PERIOD OF 240 DAYS OR MORE IN A FACTORY DURING A CALENDAR YEAR SHALL BE ALLOWED DURING THE SUBSEQUENT CALENDAR YEAR, LEAVE WITH WAGES FOR A NUMBER OF DAYS CALCULATED AT THE RATE OF -
a) IF AN ADULT, ONE DAY FOR EVERY TWENTY DAYS OF WORK PERFORMED BY HIM DURING THE PREVIOUS CALENDAR YEAR;
b) IF A CHILD, ONE DAY FOR EVERY FIFTEEN DAYS OF WORK PERFORMED BY HIM DURING THE PREVIOUS CALENDAR YEAR.
THANKS
RAHUL