-79.56% is the change from 641 to 131
Calculation steps:
[( 131 - 641 ) ÷ 641] x 100 = -79.56%
Formula
Percentage change = [(131 - 641) / 641] x 100
Subtract the new number by the original number
131 - 641 = -510
-510 ÷ 641 = -0.7956318252730109
-0.7956318252730109 x 100 = -79.56%