-88.94% is the change from 642 to 71
Calculation steps:
[( 71 - 642 ) ÷ 642] x 100 = -88.94%
Formula
Percentage change = [(71 - 642) / 642] x 100
Subtract the new number by the original number
71 - 642 = -571
-571 ÷ 642 = -0.8894080996884736
-0.8894080996884736 x 100 = -88.94%