-29.72% is the change from 821 to 577
Calculation steps:
[( 577 - 821 ) ÷ 821] x 100 = -29.72%
Formula
Percentage change = [(577 - 821) / 821] x 100
Subtract the new number by the original number
577 - 821 = -244
-244 ÷ 821 = -0.2971985383678441
-0.2971985383678441 x 100 = -29.72%