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ahh i thought you are referring to one of the Q in schweser’s mock because those figures look familiar.
Basically the formula is as follows ( I couldn’t calculate your example because ur incurable is included in the curable figure):
(Replacement cost + developer’s profit)
– curable deterioration
– (effective age / total economic life) * (replacement cost + developer’s profit – curable deterioration)
– functional obsolescence
– location obsolescence
– economic obsolescence
+ market value of land
Again, I’ve double checked and i can confirm that incurable is indeed effective age / total economic life so if incurable increases the effective age increases as well.