1. Find the percent change a. From 80 to 100 b. From 800 to 500

To find the percent change, you can use the formula: Percent Change = (New Value - Old Value) / Old Value * 100. For the first one, going from 80 to 100, it’s (100 - 80) / 80 * 100 = 25%. For the second, going from 800 to 500, it’s (500 - 800) / 800 * 100 = -37.5%. So, we see that the first scenario shows a positive growth, while the second is a decline. It’s always useful to clearly distinguish between positive and negative changes, as they tell different stories about growth and decline! Percent change can help businesses understand market trends, while individuals can track their personal finance progress.