so I dare not attempt this percentage thing. But, I can tell you that we booked for 2 people 8 nights at CSR, got 8 day MYW tickets with park hopping PLUS the dining plan for $2,008.00. I did the math (I can add and subtract) to see how much it would be if we booked it a la carte with no discount on the room and we saved $530.00.
Now, Lord knows how to do that percentage BUT I think it varies based on where you're staying, what season it is for that resort, how many nights, etc, etc.
PamNC