The table below shows the effective exchange rate index for Country Z in 2021 and 2023.
| Year | Effective exchange rate index |
|---|---|
| 2021 | 80 |
| 2023 | 100 |
All other things being equal, which one of the following options provides both the correct percentage change in the index from 2021 to 2023 and a valid reason why this change may have occurred?
20%20\%20% change; reason: A decrease in interest rates in Country Z
20%20\%20% change; reason: An increase in interest rates in Country Z
25%25\%25% change; reason: A decrease in interest rates in Country Z
25%25\%25% change; reason: An increase in interest rates in Country Z
310 exam-style questions on AQA A Level Economics 2.6 The international economy (A-level only), covering 2.6.1 Globalisation, 2.6.2 Trade, 2.6.3 The balance of payments, 2.6.4 Exchange rate systems, and 2.6.5 Economic growth and development. Each one has a worked solution and a mark scheme showing where the marks go.