-61.24% is the change from 645 to 250
Calculation steps:
[( 250 - 645 ) ÷ 645] x 100 = -61.24%
Formula
Percentage change = [(250 - 645) / 645] x 100
Subtract the new number by the original number
250 - 645 = -395
-395 ÷ 645 = -0.6124031007751938
-0.6124031007751938 x 100 = -61.24%