Question: how to calculate percentage time difference?
Answer: Find the absolute difference between two numbers: |20 - 30| = |-10| = 10. Find the average of those two numbers: (20 + 30) / 2 = 50 / 2 = 25. Divide the difference by the average: 10 / 25 = 0.4. Express it as percentages: 0.4 * 100 = 40%