Chapter 2 - Solving Equations - 2-10 Change Expressed as a Percent - Practice and Problem-Solving Exercises - Page 148: 11

Decrease; 4%

The new number is lower than the original number, so we use the equation for percent decrease. The equation for percent decrease is the following: $(\frac{original amount - new amount}{original amount})\times100$ Thus, we plug in the numbers to find: $(\frac{40.2-38.6}{40.2})\times100\approx4$%