I see you still don't understand.
At sea level, using a -50C2, you will have rated thrust, 51,800 lbs, with an N1 ranging from anywhere between 100.6 to 114.6. That is the closest to an exact answer there is, until all variables have been defined.
You came up with an answer. Not the answer, but a answer. I don't see why that is so difficult to understand?