Real exchange rate=(nominal exchange rate*price of the foreign basket)/(the price of the domestic basket)
1) Real exchange rate from the perspective of US=($0.12*22GTQ)/$3.40
=0.7764
2) Real exchange rate from the perspective of Guatamala={(1/0.12)GTQ*$3.40}/22GTQ
=1.2879
note: The nominal exchange rate is the number of units of domestic currency that are needed to buy one unit of given foreign currency. Here in Guatamala, to buy $1 it needs (1/0.12) GTQ. So the nominal exchange rate of Guatamala is 1/0.12 GTQ.
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