-24.03% is the change from 645 to 490
Calculation steps:
[( 490 - 645 ) ÷ 645] x 100 = -24.03%
Formula
Percentage change = [(490 - 645) / 645] x 100
Subtract the new number by the original number
490 - 645 = -155
-155 ÷ 645 = -0.24031007751937986
-0.24031007751937986 x 100 = -24.03%