-95.71% is the change from 490 to 21
Calculation steps:
[( 21 - 490 ) ÷ 490] x 100 = -95.71%
Formula
Percentage change = [(21 - 490) / 490] x 100
Subtract the new number by the original number
21 - 490 = -469
-469 ÷ 490 = -0.9571428571428572
-0.9571428571428572 x 100 = -95.71%