-35.47% is the change from 640 to 413
Calculation steps:
[( 413 - 640 ) ÷ 640] x 100 = -35.47%
Formula
Percentage change = [(413 - 640) / 640] x 100
Subtract the new number by the original number
413 - 640 = -227
-227 ÷ 640 = -0.3546875
-0.3546875 x 100 = -35.47%