-8.16% is the change from 490 to 450
Calculation steps:
[( 450 - 490 ) ÷ 490] x 100 = -8.16%
Formula
Percentage change = [(450 - 490) / 490] x 100
Subtract the new number by the original number
450 - 490 = -40
-40 ÷ 490 = -0.08163265306122448
-0.08163265306122448 x 100 = -8.16%