821.35% is the change from 89 to 820
Calculation steps:
[( 820 - 89 ) ÷ 89] x 100 = 821.35%
Formula
Percentage change = [(820 - 89) / 89] x 100
Subtract the new number by the original number
820 - 89 = 731
731 ÷ 89 = 8.213483146067416
8.213483146067416 x 100 = 821.35%