To answer this question, we will use the following formula for the percent of change:
[tex]P=\frac{F-I}{I}\times100,[/tex]where F is the final height and I is the initial height.
Substituting F=7, and I=3 we get:
[tex]P=\frac{7-3}{3}\times100.[/tex]Simplifying the above result we get:
[tex]F=\frac{400}{3}\text{.}[/tex]Answer: 400/3 %.