Miketz: Paroah’s Taxes 2

Yosef proposed to Paraoh that he should raise the taxes on grain from 1/10th to 1/5th [Bereishis 41:34]. 

Question: What percentage was the increase from the original amount?

Answer: (1/5) – (1/10) = (1/5)

the difference/the original (1/5)/(1/5) = 1 100%