There are Two Popular method in india for calculating salary :
1) Total Month Days (with sunday) : means if salary is 3000 PM then per day salary would be 3000/30 (month days) = 100 rs per day.
now 15 is present. we should cover till last day present sundays means we have to add 2 or 3 sunday .
Present = 15 , Sunday = 2 , total days = 17 x 100 = 1700 rs.
In this method some rules also work that if somebody is absent on saturday and monday then that sunday will not include. it is not practicle to check every body sunday which it concern big quantity employee.
2) Total days (without sunday) method : I prefer this. Labour dept,esic,pf,leave encashment every dept is also satisfy with this method.
in this method if salary is 3000 pm and month total days is 26. then per day salary would be = 3000/26=Rs 115.38
and now total 15 days present then :
Present = 15
Any approved leave = 0
Any holiday = 0
total days = 15
Gross salary is : 15 x 115.38 = 1730.00
now if you compare this that as per method 1 salary is 1700. and as per method 2 salary is 1730. why ?
because of sunday..... if you count 3 sunday salary would be 1800.00.
every time, no employee would satisfy about sunday calculation.
thats why now a days big orgnization are adopting method 2.
Simple and best. And approved by Factory ACT also.