-93.29% is the change from 820 to 55
Calculation steps:
[( 55 - 820 ) ÷ 820] x 100 = -93.29%
Formula
Percentage change = [(55 - 820) / 820] x 100
Subtract the new number by the original number
55 - 820 = -765
-765 ÷ 820 = -0.9329268292682927
-0.9329268292682927 x 100 = -93.29%