-80.61% is the change from 428 to 83
Calculation steps:
[( 83 - 428 ) ÷ 428] x 100 = -80.61%
Formula
Percentage change = [(83 - 428) / 428] x 100
Subtract the new number by the original number
83 - 428 = -345
-345 ÷ 428 = -0.8060747663551402
-0.8060747663551402 x 100 = -80.61%