Jessica is collecting aluminum cans during the summer for a recycling project. She collected 120 aluminum cans in June and 150 aluminum cans in July. What is the percentage change if the number of cans she collected in June and the number of cache she collected in July?

To find the percentage change, we first need to find the difference between the two numbers.

In this case, the difference is 150 - 120 = 30.

Next, we need to find the percentage of the difference relative to the original number.
To do this, we divide the difference by the original number and multiply by 100.
In this case, the percentage change is (30/120) * 100 = 0.25 * 100 = 25%.

Therefore, the percentage change is 25%.