1. The problem involves analyzing exchange rate movements between USD and SGD over a period. 2. To understand exchange rate changes, we can calculate the daily change or percentage change using the formula: $$\text{Percentage Change} = \frac{\text{New Rate} - \text{Old Rate}}{\text{Old Rate}} \times 100$$ 3. For example, to find the percentage change in USD from 2-Jan-25 to 3-Jan-25: $$\frac{4.501 - 4.4785}{4.4785} \times 100 = \frac{0.0225}{4.4785} \times 100 \approx 0.502\%$$ 4. Similarly, for SGD from 2-Jan-25 to 3-Jan-25: $$\frac{3.2799 - 3.2879}{3.2879} \times 100 = \frac{-0.008}{3.2879} \times 100 \approx -0.243\%$$ 5. This means USD appreciated by approximately 0.502% while SGD depreciated by approximately 0.243% on that day. 6. You can apply this formula to any two consecutive dates to analyze the trend. 7. This method helps in understanding currency strength and market movements over time. Final answer: The percentage change formula is $$\frac{\text{New Rate} - \text{Old Rate}}{\text{Old Rate}} \times 100$$ and applying it to the data gives daily exchange rate movement insights.