-54.37% is the change from 640 to 292
Calculation steps:
[( 292 - 640 ) ÷ 640] x 100 = -54.37%
Formula
Percentage change = [(292 - 640) / 640] x 100
Subtract the new number by the original number
292 - 640 = -348
-348 ÷ 640 = -0.54375
-0.54375 x 100 = -54.37%