-88.99% is the change from 899 to 99
Calculation steps:
[( 99 - 899 ) ÷ 899] x 100 = -88.99%
Formula
Percentage change = [(99 - 899) / 899] x 100
Subtract the new number by the original number
99 - 899 = -800
-800 ÷ 899 = -0.8898776418242491
-0.8898776418242491 x 100 = -88.99%