-55% is the change from 420 to 189
Calculation steps:
[( 189 - 420 ) ÷ 420] x 100 = -55%
Formula
Percentage change = [(189 - 420) / 420] x 100
Subtract the new number by the original number
189 - 420 = -231
-231 ÷ 420 = -0.55
-0.55 x 100 = -55%
Example