-56.71% is the change from 820 to 355
Calculation steps:
[( 355 - 820 ) ÷ 820] x 100 = -56.71%
Formula
Percentage change = [(355 - 820) / 820] x 100
Subtract the new number by the original number
355 - 820 = -465
-465 ÷ 820 = -0.5670731707317073
-0.5670731707317073 x 100 = -56.71%