Satish u have not mentioned that ur children studying or not to include the that price.

for lead a normal life, monthly u requuired
FF accomodation : 2 Bed room flat(small size) : 7,000
Car saloon like lancer,aveo,skoda : 1,750
Fuel + services : 250
Food maximum : 1,500
School education even nursery 1 chd: 700/-

Hope u might have got an approx amount..