Bought one last year and i paid the Dlr Rs 23,000+ for registration, which i guess also included the Agent's Commission. You will most likely pay lesser then that.
I hope your dad or your company is paying for the fuel. BAD idea to buy a Alto Petrol version. This car is mental on petrol, BOTH in terms of Acceleration and fuel consumption.
On the flip side you get relatively modest CNG consumption figures with pathetic acceleration.
Regards