-38.12% is the change from 842 to 521
Calculation steps:
[( 521 - 842 ) ÷ 842] x 100 = -38.12%
Formula
Percentage change = [(521 - 842) / 842] x 100
Subtract the new number by the original number
521 - 842 = -321
-321 ÷ 842 = -0.3812351543942993
-0.3812351543942993 x 100 = -38.12%