-68% is the change from 250 to 80
Calculation steps:
[( 80 - 250 ) ÷ 250] x 100 = -68%
Formula
Percentage change = [(80 - 250) / 250] x 100
Subtract the new number by the original number
80 - 250 = -170
-170 ÷ 250 = -0.68
-0.68 x 100 = -68%
Example