Question

There were 420 gumballs in a jar but then more were added so that there were 500 gumballs. What is the percent of change? Round to the nearest whole percent.
16%
80%
19%
84%

Answer 1

To find the percent change, you can use the formula:

\[
\text{Percent Change} = \frac{\text{new value} - \text{old value}}{\text{old value}} \times 100
\]

In this case:
- Old value = 420 gumballs
- New value = 500 gumballs

Now, plug these values into the formula:

\[
\text{Percent Change} = \frac{500 - 420}{420} \times 100 = \frac{80}{420} \times 100
\]

Calculate the fraction:

\[
\frac{80}{420} \approx 0.190476
\]

Now, multiply by 100 to convert it to a percentage:

\[
0.190476 \times 100 \approx 19.05
\]

Rounding to the nearest whole percent gives us:

\[
19\%
\]

Thus, the percent of change is **19%**.