-81.31% is the change from 428 to 80
Calculation steps:
[( 80 - 428 ) ÷ 428] x 100 = -81.31%
Formula
Percentage change = [(80 - 428) / 428] x 100
Subtract the new number by the original number
80 - 428 = -348
-348 ÷ 428 = -0.8130841121495327
-0.8130841121495327 x 100 = -81.31%