Answer: [tex]35\%[/tex]
Step-by-step explanation:
For this exercise you need to use the following formula:
[tex]\%increase=\frac{New\ value-Old\ value}{Old\ value}*100[/tex]
According to the exercise, the number of kids in a robotics club grew from 23 to 31; then you can identify that:
[tex]New\ value=31\\\\Old\ value=23[/tex]
Knowing these values, you can substitute them into the equation and then evaluate, in order to find the percent increase in the number of kids in the club. Then:
[tex]\%increase=\frac{31-23}{23}*100\\\\\%increase=34.78\%[/tex]
Rounding it to the nearest whole percent:
[tex]\%increase=35\%[/tex]
