-82.04% is the change from 501 to 90
Calculation steps:
[( 90 - 501 ) ÷ 501] x 100 = -82.04%
Formula
Percentage change = [(90 - 501) / 501] x 100
Subtract the new number by the original number
90 - 501 = -411
-411 ÷ 501 = -0.8203592814371258
-0.8203592814371258 x 100 = -82.04%