-94.53% is the change from 640 to 35
Calculation steps:
[( 35 - 640 ) ÷ 640] x 100 = -94.53%
Formula
Percentage change = [(35 - 640) / 640] x 100
Subtract the new number by the original number
35 - 640 = -605
-605 ÷ 640 = -0.9453125
-0.9453125 x 100 = -94.53%