-33.85% is the change from 641 to 424
Calculation steps:
[( 424 - 641 ) ÷ 641] x 100 = -33.85%
Formula
Percentage change = [(424 - 641) / 641] x 100
Subtract the new number by the original number
424 - 641 = -217
-217 ÷ 641 = -0.33853354134165364
-0.33853354134165364 x 100 = -33.85%