-29.63% is the change from 820 to 577
Calculation steps:
[( 577 - 820 ) ÷ 820] x 100 = -29.63%
Formula
Percentage change = [(577 - 820) / 820] x 100
Subtract the new number by the original number
577 - 820 = -243
-243 ÷ 820 = -0.29634146341463413
-0.29634146341463413 x 100 = -29.63%