Answer:
-20%
Explanation:
The percentage of decrease is found by finding the difference between the two prices and dividing it by the orignal price.
$18.80 - $23.50 = - $4.70. Now divide it by 23.50.
-4.70/ 23.50 = -0.20
Times -0.20 by 100 to convert to a percentage. -20%