-61.25% is the change from 400 to 155
Calculation steps:
[( 155 - 400 ) ÷ 400] x 100 = -61.25%
Formula
Percentage change = [(155 - 400) / 400] x 100
Subtract the new number by the original number
155 - 400 = -245
-245 ÷ 400 = -0.6125
-0.6125 x 100 = -61.25%