-67.86% is the change from 420 to 135
Calculation steps:
[( 135 - 420 ) ÷ 420] x 100 = -67.86%
Formula
Percentage change = [(135 - 420) / 420] x 100
Subtract the new number by the original number
135 - 420 = -285
-285 ÷ 420 = -0.6785714285714286
-0.6785714285714286 x 100 = -67.86%