-49.29% is the change from 990 to 502
Calculation steps:
[( 502 - 990 ) ÷ 990] x 100 = -49.29%
Formula
Percentage change = [(502 - 990) / 990] x 100
Subtract the new number by the original number
502 - 990 = -488
-488 ÷ 990 = -0.49292929292929294
-0.49292929292929294 x 100 = -49.29%