MPR Equation. (in General)

Uhtred [The Z-Fighters] September 17 2:24 AM EDT

So after some crunching, I still need help with this equation MPR = (EXP/1.4307)^(1/1.2501). From my numbers one MPR is about 87 to 90xp in my development range. But when I follow the given formula its WAY off. What am I missing here?
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