-98.16% is the change from 490 to 9
Calculation steps:
[( 9 - 490 ) ÷ 490] x 100 = -98.16%
Formula
Percentage change = [(9 - 490) / 490] x 100
Subtract the new number by the original number
9 - 490 = -481
-481 ÷ 490 = -0.9816326530612245
-0.9816326530612245 x 100 = -98.16%