Hi Damodar,
Rentals rates depends on locality as you mention that you are looking your property for rent in Panaji, Goa where the 3 BHK flats comes at 20-22K, @ 145/sq.mt. this rent includes water and electricity charges for that you have to pay 3 months security deposit, 1 month advance rent with 11 months agreement. If you rent through broker then you have to pay 1 month brokerage to broker.