-96.33% is the change from 490 to 18
Calculation steps:
[( 18 - 490 ) ÷ 490] x 100 = -96.33%
Formula
Percentage change = [(18 - 490) / 490] x 100
Subtract the new number by the original number
18 - 490 = -472
-472 ÷ 490 = -0.963265306122449
-0.963265306122449 x 100 = -96.33%