-35.31% is the change from 640 to 414
Calculation steps:
[( 414 - 640 ) ÷ 640] x 100 = -35.31%
Formula
Percentage change = [(414 - 640) / 640] x 100
Subtract the new number by the original number
414 - 640 = -226
-226 ÷ 640 = -0.353125
-0.353125 x 100 = -35.31%