-24.15% is the change from 646 to 490
Calculation steps:
[( 490 - 646 ) ÷ 646] x 100 = -24.15%
Formula
Percentage change = [(490 - 646) / 646] x 100
Subtract the new number by the original number
490 - 646 = -156
-156 ÷ 646 = -0.24148606811145512
-0.24148606811145512 x 100 = -24.15%