I guess I wasn't too clear with my question. I'm trying to determine the total cost between taking just a taxi from the airport to the Sheraton Olympiapark, taking the Lufthansa bus to the hauptbanhof then a taxi from there on to the hotel.
From Munich Airport
1. Taxi to Sheraton Olympiapark - x Euros x2 (roundtrip) = ?Euros
2. Roundtrip LH bus to Hauptbanhof, 2 adults, 2 kids (15Ex2 + 9Ex2 = 48E) + Taxifare from station to hotel (?Euros) = ?Euros

Another option is to also use the S-bahn, U-bahn but I'm not sure I want to do this with my 2 kids in tow and luggage. I did this in London and it was a hassle.

thx in advance again.