-89.57% is the change from 949 to 99
Calculation steps:
[( 99 - 949 ) ÷ 949] x 100 = -89.57%
Formula
Percentage change = [(99 - 949) / 949] x 100
Subtract the new number by the original number
99 - 949 = -850
-850 ÷ 949 = -0.8956796628029505
-0.8956796628029505 x 100 = -89.57%