Depends on a lot of factors like what type of place you would like to stay, what activities you would like to include and many more. So it would be helpful if you could share some more details then I can say you the average price of the trip
Depends on what kind accomdations you goa book mode of travel. if looking for budget one. book flights in advance through skyscanner. try couchsurfing, airbnb and trivago fo stays and preppan itinrary and local transportation in these places.
A rough estimate of the cost can be :
airfare (from mumbai or Delhi. Landing in Prague and flying out of Amsterdam) = 40000
Multi entry Schenzen visa : 8000
Inter city/country train / plane : 10000
economical hotel Bed & breakfast for 8 days : 40000
other food and sightseeing expenses : 30000
Total : 130000
(This is approx costing)
depends on lot of factor like the kind of flight , hotel etc you choose. whether u are visiting in off season or not
Schengen Visa: 4.4k, Flight to Amsterdam: 20k, 2 days in hostel: 4k, 2 day city pass: 9k, Bus from Amsterdam to Berlin: 1.6k, 3 days in hostel: 3.3k, 3 days city pass: 9k, Berlin to Prague bus: 1.4k, City Pass : 4.3k and Hostel: 1.2k, Flight from Prague to Mumbai: 18k, Total: 77k