-34.76% is the change from 820 to 535
Calculation steps:
[( 535 - 820 ) ÷ 820] x 100 = -34.76%
Formula
Percentage change = [(535 - 820) / 820] x 100
Subtract the new number by the original number
535 - 820 = -285
-285 ÷ 820 = -0.3475609756097561
-0.3475609756097561 x 100 = -34.76%