Chapter 4 - Exponential Functions - Review Exercises and Problems for Chapter Four - Page 176: 9

$20 \%$ and $2 \%$

The percent of change is given by $$ \text { Percent of change }=\frac{\text { Amount of change }}{\text { Old amount }} \cdot 100 \% $$ $$ \text { Percent of change from } 10 \text { to } 12=\frac{12-10}{10} \cdot 100 \%=20 \% $$ $$ \text { Percent of change from } 100 \text { to } 102=\frac{102-100}{100} \cdot 100 \%=2 \% $$