-61.77% is the change from 837 to 320
Calculation steps:
[( 320 - 837 ) ÷ 837] x 100 = -61.77%
Formula
Percentage change = [(320 - 837) / 837] x 100
Subtract the new number by the original number
320 - 837 = -517
-517 ÷ 837 = -0.6176821983273596
-0.6176821983273596 x 100 = -61.77%