-99% is the change from 897 to 9
Calculation steps:
[( 9 - 897 ) ÷ 897] x 100 = -99%
Formula
Percentage change = [(9 - 897) / 897] x 100
Subtract the new number by the original number
9 - 897 = -888
-888 ÷ 897 = -0.9899665551839465
-0.9899665551839465 x 100 = -99%