-20% is the change from 990 to 792
Calculation steps:
[( 792 - 990 ) ÷ 990] x 100 = -20%
Formula
Percentage change = [(792 - 990) / 990] x 100
Subtract the new number by the original number
792 - 990 = -198
-198 ÷ 990 = -0.2
-0.2 x 100 = -20%
Example