St on rcm

Service receiver is a corporate entity receiving Manpower supply services from non corporate entity following are the transactions details:

Security charges: Rs.11500

25% ST                : Rs. 355.35

Total Bill amount : Rs. 11855.35

75% st : Rs. 1066.05 (st paid by Service receiver)

i wish to know accounting entries for the above transaction. Also manner in which ST-3 return to be filled. Please give your suggestions