-63.18% is the change from 421 to 155
Calculation steps:
[( 155 - 421 ) ÷ 421] x 100 = -63.18%
Formula
Percentage change = [(155 - 421) / 421] x 100
Subtract the new number by the original number
155 - 421 = -266
-266 ÷ 421 = -0.6318289786223278
-0.6318289786223278 x 100 = -63.18%