Original: 132 students

New: 150 students

Since the new students are greater than the original, this is a percent of increase.

The students of change = New students – Original students.

The students of change = .

Let r be the percentage of increase.

Use the original number, 132 as the base.

The percent proportion is

To solve for r, first find the cross products.

                                  (Multiply: )

                    (Divide each side by 45)

                                          (Cancel common terms)

                                 (Divide: )

The percentage of increase by .

The percent of change is a percent of increase.

The percentage of increase by .