$\"\"$

Subtract to find the amount of change.

New measurement $\"\"$ original measurement

55 $\"\"$ 80

= $\"\"$ 25 (Subtract: 55 $\"\"$ 80 = $\"\"$ 25) $\"\"$

Write a ratio that compares the amount of change to the original amount.Express the ratio as a percent.

Percent change = $\"\"$ .

$\"\"$

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

Write decimal as percent.

Multiply by 100 and add $\"\"$ .

$\"\"$

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

The percent of change is about $\"\"$ .In this case, the percent of change is a percent of decrease.