-58.59% is the change from 640 to 265
Calculation steps:
[( 265 - 640 ) ÷ 640] x 100 = -58.59%
Formula
Percentage change = [(265 - 640) / 640] x 100
Subtract the new number by the original number
265 - 640 = -375
-375 ÷ 640 = -0.5859375
-0.5859375 x 100 = -58.59%