How do I approach this question?

The Danish krone changes from A$0.7877 each at the start of 2020 to A$0.8027 each at the end of 2020. Over that same year, inflation in the prices of all goods and services in Denmark is 7.3%, whereas in Australia it is 3.9%. What is the amount of real decrease (-) or real increase (+) that the Danish krone experiences against the Australian dollar during 2020? Select one: a. +5.2% b. -1.3% c. +11.5% d. -11.5% e. -5.0% X The correct answer is: +5.2%