-20% is the change from 250 to 200
Calculation steps:
[( 200 - 250 ) ÷ 250] x 100 = -20%
Formula
Percentage change = [(200 - 250) / 250] x 100
Subtract the new number by the original number
200 - 250 = -50
-50 ÷ 250 = -0.2
-0.2 x 100 = -20%
Example