1. yes he is entitled for compensatory off for 4 Sundays.
2. Hope he will be eligible for travel expenses and Food/accomodation expenses by the company. Just give him 4 compensatory off.
If you are paying for 26 days you have to pay him 30 days or 4 days paid leave/CO.
Else if you are paying for 30 days just give CO. if any national festival holiday is there you have to pay 1 day extra salary/CO for that festival day.
From India, Mumbai
Thanks a lot
From India, Aligarh