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I have been reading from this textbook which talks about CPI and inflation
http://faculty.washington.edu/cnelson/Chap04.pdf
On pages 5 and 6, it talks about how they are deflating the nominal income using the CPI. But in page 6, they work out the percentage difference in real income between two years, and they state that is the net difference of her increase in real income and inflation
But I thought using the CPI was getting rid of the effect of inflation? What am I not undersranding?
Indeed deflating nominal income using CPI does get rid of the effect of inflation. I think you're just getting confused by the phrasing.
I assume you are referring to the following sentence on pg. 6:
We have shown that the net result of her raise and inflation was an increase of 7.9% in real income.
Let me rephrase this sentence: we have shown that after raising her salary by 10% and then adjusting for inflation, the net effect is that her real income increased by 7.9%.
