-41.09% is the change from 640 to 377
Calculation steps:
[( 377 - 640 ) ÷ 640] x 100 = -41.09%
Formula
Percentage change = [(377 - 640) / 640] x 100
Subtract the new number by the original number
377 - 640 = -263
-263 ÷ 640 = -0.4109375
-0.4109375 x 100 = -41.09%