valuation in emerging markets - schweser video cds

hi, I am working through the concept checkers on page 125 book 4 of schweser Q 10 and the formula to come up with the RFR seems to be adding the inflation differential to the US Govt T bond yield while on the schweser CD the inflation differential is deducted could someone please confirm which is the correct way or whether I am mixing things up? In the meantime i will check the cfa textbooks. Thanks

I just had a look at CFA text for valuation in emerging markets given that it is not my favourite topic I thought of reviewing it today. There are no questions at the end of the chapter??? So it this the case that the questions can be just interpretion?