-23.26% is the change from 645 to 495
Calculation steps:
[( 495 - 645 ) ÷ 645] x 100 = -23.26%
Formula
Percentage change = [(495 - 645) / 645] x 100
Subtract the new number by the original number
495 - 645 = -150
-150 ÷ 645 = -0.23255813953488372
-0.23255813953488372 x 100 = -23.26%