If a person is daily-rated employee, Sundays (if he has not worked for Sunday) can be excluded alongwith other leave days, while computing his/her wages. But if he is a monthly-rated employee, his/her salary includes for Sundays (weekly-off day) also. So, if he /she availed leave for Monday to Thursday, the preceding Sunday need not be deducted.
(If he/she has leaves in his/her credit, no deduction can be made from his/her salary)