Answer:
b) The US dollar would appreciate and the real exchange rate would stay the same.
Explanation:
Increase in Inflation in US: 1,200 / 1,000 - 1 * 100 = 20%
Increase in Inflation in Poland: 8,000 / 6,400 - 1 * 100 = 25%
Law of one price states that identical goods should be exchanged at equal prices in different countries valued in local currencies. This law is known as purchasing power parity theory.
According to the theory, increase (decrease) in prices of goods or a basket of goods in one country will result in depreciation (appreciation) of its currency so exchange rate-adjusted prices are constant across countries.
In our question, the price of basked of goods has increased by 25% in Poland as compared to 20% in U.S. thus implying depreciation of Polish zloty against US dollar or appreciation of US against Policy zloty.