-35.61% is the change from 820 to 528
Calculation steps:
[( 528 - 820 ) ÷ 820] x 100 = -35.61%
Formula
Percentage change = [(528 - 820) / 820] x 100
Subtract the new number by the original number
528 - 820 = -292
-292 ÷ 820 = -0.35609756097560974
-0.35609756097560974 x 100 = -35.61%