-25% is the change from 200 to 150
Calculation steps:
[( 150 - 200 ) ÷ 200] x 100 = -25%
Formula
Percentage change = [(150 - 200) / 200] x 100
Subtract the new number by the original number
150 - 200 = -50
-50 ÷ 200 = -0.25
-0.25 x 100 = -25%
Example