-90.73% is the change from 820 to 76
Calculation steps:
[( 76 - 820 ) ÷ 820] x 100 = -90.73%
Formula
Percentage change = [(76 - 820) / 820] x 100
Subtract the new number by the original number
76 - 820 = -744
-744 ÷ 820 = -0.9073170731707317
-0.9073170731707317 x 100 = -90.73%