-95.84% is the change from 505 to 21
Calculation steps:
[( 21 - 505 ) ÷ 505] x 100 = -95.84%
Formula
Percentage change = [(21 - 505) / 505] x 100
Subtract the new number by the original number
21 - 505 = -484
-484 ÷ 505 = -0.9584158415841584
-0.9584158415841584 x 100 = -95.84%