Hi Mr.Surajit Das,
This is in regards to your query posted on the website CarDekho.com, we would like to inform you that Tata Nano has boot space (Cargo Volume/ Luggage Space) of 300 liters. You can use the given link of Tata Nano to read more about Tata Nano.
New Tata Nano with EasyShift is available at Rs. 2 lac (Ex-showroom, Delhi), and the final cost depends on the valuation of your car. So, first get the valuation of your car from authorized Tata dealer, so he can give you a final quote for the new car.