-75.82% is the change from 521 to 126
Calculation steps:
[( 126 - 521 ) ÷ 521] x 100 = -75.82%
Formula
Percentage change = [(126 - 521) / 521] x 100
Subtract the new number by the original number
126 - 521 = -395
-395 ÷ 521 = -0.7581573896353166
-0.7581573896353166 x 100 = -75.82%