-58.28% is the change from 640 to 267
Calculation steps:
[( 267 - 640 ) ÷ 640] x 100 = -58.28%
Formula
Percentage change = [(267 - 640) / 640] x 100
Subtract the new number by the original number
267 - 640 = -373
-373 ÷ 640 = -0.5828125
-0.5828125 x 100 = -58.28%