-73.48% is the change from 641 to 170
Calculation steps:
[( 170 - 641 ) ÷ 641] x 100 = -73.48%
Formula
Percentage change = [(170 - 641) / 641] x 100
Subtract the new number by the original number
170 - 641 = -471
-471 ÷ 641 = -0.734789391575663
-0.734789391575663 x 100 = -73.48%