-93.65% is the change from 661 to 42
Calculation steps:
[( 42 - 661 ) ÷ 661] x 100 = -93.65%
Formula
Percentage change = [(42 - 661) / 661] x 100
Subtract the new number by the original number
42 - 661 = -619
-619 ÷ 661 = -0.9364599092284418
-0.9364599092284418 x 100 = -93.65%