$\"\"$ $\"\"$

Original: 25

New: 18

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, 25 as the base.

The percent proportion is

$\"\"$

To solve for r, first find the cross products.

$\"\"$

$\"\"$ (Multiply: $\"\"$ )

$\"\"$ (Divide each side by 25)

$\"\"$ (Cancel common terms)

$\"\"$ (Divide: $\"\"$ )

The percentage of decrease by $\"\"$ . $\"\"$

The percent of change is a percent of decrease.The percentage of decrease by $\"\"$ .