-22.5% is the change from 200 to 155
Calculation steps:
[( 155 - 200 ) ÷ 200] x 100 = -22.5%
Formula
Percentage change = [(155 - 200) / 200] x 100
Subtract the new number by the original number
155 - 200 = -45
-45 ÷ 200 = -0.225
-0.225 x 100 = -22.5%