-40.78% is the change from 640 to 379
Calculation steps:
[( 379 - 640 ) ÷ 640] x 100 = -40.78%
Formula
Percentage change = [(379 - 640) / 640] x 100
Subtract the new number by the original number
379 - 640 = -261
-261 ÷ 640 = -0.4078125
-0.4078125 x 100 = -40.78%