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

There was an increase of about $27\%$.

Change in value: $=\text{new amount} - \text{original amount} \\= 9.5-7.5 \\= 2$ There was an increase. Percent Change: $ =\dfrac{\text{change in value}}{\text{original amount}} \\=\dfrac{2}{7.5} \\\approx 0.27 \\\approx 27\%$ There was an increase of around $27\%$.