-28% is the change from 250 to 180
Calculation steps:
[( 180 - 250 ) ÷ 250] x 100 = -28%
Formula
Percentage change = [(180 - 250) / 250] x 100
Subtract the new number by the original number
180 - 250 = -70
-70 ÷ 250 = -0.28
-0.28 x 100 = -28%
Example