-79.71% is the change from 488 to 99
Calculation steps:
[( 99 - 488 ) ÷ 488] x 100 = -79.71%
Formula
Percentage change = [(99 - 488) / 488] x 100
Subtract the new number by the original number
99 - 488 = -389
-389 ÷ 488 = -0.7971311475409836
-0.7971311475409836 x 100 = -79.71%