Expected Inflation or Inflation

If in a question which gives you both expected inflation and inflation (for that period) for both demostic and foreign countries and spot FX rates, what do you use to calculate relative PPP? Expected inf or inf? May be tricky here.

I would think expected inflation.

check the CFAI book:-). I think it should be expected inf too, but seem not.

What do you mean inflation for that period?

its on the book, check it out.

Too lazy sorry, I got book 7 in front of me and going over the 06 questions. I am pretty pathetic.