Question

Pilar has 40 shells in her collection. She goes to the beach. Shecollects 6 more shells in the morning and 3 more shells in theafternoon. What is the percent change in Pilar's shell collectionfrom the beginning of the day to the end?

Answer 1

the increment in the number of shells is 9

the original number of shells is 40

the percent change is computed as follows:

$\frac{\text{ increment}}{\text{ original}}\cdot100$

Substituting:

$\begin{gathered} \text{ percent change=}\frac{9}{40}\cdot100 \\ \text{ percent change=}22.5\text{ \%} \end{gathered}$