-9.09% is the change from 902 to 820
Calculation steps:
[( 820 - 902 ) ÷ 902] x 100 = -9.09%
Formula
Percentage change = [(820 - 902) / 902] x 100
Subtract the new number by the original number
820 - 902 = -82
-82 ÷ 902 = -0.09090909090909091
-0.09090909090909091 x 100 = -9.09%