-68.75% is the change from 80 to 25
Calculation steps:
[( 25 - 80 ) ÷ 80] x 100 = -68.75%
Formula
Percentage change = [(25 - 80) / 80] x 100
Subtract the new number by the original number
25 - 80 = -55
-55 ÷ 80 = -0.6875
-0.6875 x 100 = -68.75%
Example