econ: currency exposure

if “A holds a U.K. security and has estimated the currency exposure in local currency terms to be 1.3, what is the currency exposure in domestic currency term”? why the formula is yFC=1.3, y=yFC=1=1.3+1 =2.3 which section of econ this question comes from? Thanks.

I think this comes from international asset pricing section port. management.