-75.71% is the change from 420 to 102
Calculation steps:
[( 102 - 420 ) ÷ 420] x 100 = -75.71%
Formula
Percentage change = [(102 - 420) / 420] x 100
Subtract the new number by the original number
102 - 420 = -318
-318 ÷ 420 = -0.7571428571428571
-0.7571428571428571 x 100 = -75.71%