-94.84% is the change from 640 to 33
Calculation steps:
[( 33 - 640 ) ÷ 640] x 100 = -94.84%
Formula
Percentage change = [(33 - 640) / 640] x 100
Subtract the new number by the original number
33 - 640 = -607
-607 ÷ 640 = -0.9484375
-0.9484375 x 100 = -94.84%