-22.66% is the change from 128 to 99
Calculation steps:
[( 99 - 128 ) ÷ 128] x 100 = -22.66%
Formula
Percentage change = [(99 - 128) / 128] x 100
Subtract the new number by the original number
99 - 128 = -29
-29 ÷ 128 = -0.2265625
-0.2265625 x 100 = -22.66%