Question

1. Girl Scout Troop 321 started with 25 girls and at the end of the year party there were 31 girls. Gabby

shows her work below to find the percent of change for her troop.
31-25
31
6
31
0.1935
Gabby figures that her troop increased by about 19.4%
Describe and then correct the error Gabby made in finding the percent of change.
Pick what Gabby did wrong.
The real percent of change is:

Answer 1

Answer: 24%

Explanation:

Since we are informed that the Girl Scout Troop started with 25 girls and at the end of the year party there were 31 girls. The percentage change will be:

= (31 - 25) / 25 × 100

= 6/25 × 100

= 24%

The error that Gabby made was that she used 31 as the base. This is expressed below:

= 31 - 25) / 31 × 100

= 6/31 × 100

= 19.4%