Answer: The percent of change from 20 to 39 is 95%.
Step-by-step explanation: To find the percent of change from 20 to 39, we can use the formula:
Percent Change = (New Value - Old Value) / Old Value * 100
First, we subtract the old value (20) from the new value (39): 39 - 20 = 19.
Then, we divide this difference (19) by the old value (20): 19 / 20 = 0.95.
Next, we multiply this quotient by 100 to convert it to a percentage: 0.95 * 100 = 95.
Therefore, the percent of change from 20 to 39 is 95%.
In other words, the value increased by 95%.