We have to use the formula of the percent increase with the information given. Doing so, we have:
[tex]\begin{gathered} \text{ \% raise=}\frac{\text{ Final value - Initial value}}{\text{ Initial value}}\times100=\frac{3.40-3.20}{3.20}\times100\text{ (Replacing)} \\ \frac{3.40-3.20}{3.20}\times100=\frac{0.20}{3.20}\times100\text{ (Subtracting)} \\ \text{ }\frac{0.20}{3.20}\times100=6.25\text{ \% (Dividing and multiplying by 100)} \\ \end{gathered}[/tex]The answer is 6.25%.
