How much salary should I ask for in Poland in case I have to save 2500 PLN for my family?

Dear All,

I have been interviewed for a payroll specialist job in Poland. Having experience of 5 years I have been offered 6000 PLN net however I am asking for 8500 PLN in hand as I need to save 2500 PLN to send back for my family. Please advice how much should be sufficient for me to have healthy life there considering I am from India and will be coming alone.