-62.57% is the change from 668 to 250
Calculation steps:
[( 250 - 668 ) ÷ 668] x 100 = -62.57%
Formula
Percentage change = [(250 - 668) / 668] x 100
Subtract the new number by the original number
250 - 668 = -418
-418 ÷ 668 = -0.625748502994012
-0.625748502994012 x 100 = -62.57%