-23.53% is the change from 646 to 494
Calculation steps:
[( 494 - 646 ) ÷ 646] x 100 = -23.53%
Formula
Percentage change = [(494 - 646) / 646] x 100
Subtract the new number by the original number
494 - 646 = -152
-152 ÷ 646 = -0.23529411764705882
-0.23529411764705882 x 100 = -23.53%