-93.46% is the change from 642 to 42
Calculation steps:
[( 42 - 642 ) ÷ 642] x 100 = -93.46%
Formula
Percentage change = [(42 - 642) / 642] x 100
Subtract the new number by the original number
42 - 642 = -600
-600 ÷ 642 = -0.9345794392523364
-0.9345794392523364 x 100 = -93.46%