-54.22% is the change from 640 to 293
Calculation steps:
[( 293 - 640 ) ÷ 640] x 100 = -54.22%
Formula
Percentage change = [(293 - 640) / 640] x 100
Subtract the new number by the original number
293 - 640 = -347
-347 ÷ 640 = -0.5421875
-0.5421875 x 100 = -54.22%