-6.24% is the change from 641 to 601
Calculation steps:
[( 601 - 641 ) ÷ 641] x 100 = -6.24%
Formula
Percentage change = [(601 - 641) / 641] x 100
Subtract the new number by the original number
601 - 641 = -40
-40 ÷ 641 = -0.062402496099843996
-0.062402496099843996 x 100 = -6.24%