-91.12% is the change from 642 to 57
Calculation steps:
[( 57 - 642 ) ÷ 642] x 100 = -91.12%
Formula
Percentage change = [(57 - 642) / 642] x 100
Subtract the new number by the original number
57 - 642 = -585
-585 ÷ 642 = -0.9112149532710281
-0.9112149532710281 x 100 = -91.12%