Original: 100

New: 142

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

The amount of change = New Amount – Original Amount.

The amount of change = .

Let r be the percentage of increase.

Use the original number, 100 as the base.

The percent proportion is

To solve for r, first find the cross products.

Divide each side by 100.

The percentage of increase by 42%.

The percent of change is a percent of increase. The percentage of increase by 42%.