-23.99% is the change from 646 to 491
Calculation steps:
[( 491 - 646 ) ÷ 646] x 100 = -23.99%
Formula
Percentage change = [(491 - 646) / 646] x 100
Subtract the new number by the original number
491 - 646 = -155
-155 ÷ 646 = -0.23993808049535603
-0.23993808049535603 x 100 = -23.99%