-83.06% is the change from 490 to 83
Calculation steps:
[( 83 - 490 ) ÷ 490] x 100 = -83.06%
Formula
Percentage change = [(83 - 490) / 490] x 100
Subtract the new number by the original number
83 - 490 = -407
-407 ÷ 490 = -0.8306122448979592
-0.8306122448979592 x 100 = -83.06%