-91.11% is the change from 990 to 88
Calculation steps:
[( 88 - 990 ) ÷ 990] x 100 = -91.11%
Formula
Percentage change = [(88 - 990) / 990] x 100
Subtract the new number by the original number
88 - 990 = -902
-902 ÷ 990 = -0.9111111111111111
-0.9111111111111111 x 100 = -91.11%