-34.88% is the change from 820 to 534
Calculation steps:
[( 534 - 820 ) ÷ 820] x 100 = -34.88%
Formula
Percentage change = [(534 - 820) / 820] x 100
Subtract the new number by the original number
534 - 820 = -286
-286 ÷ 820 = -0.348780487804878
-0.348780487804878 x 100 = -34.88%