-89.42% is the change from 397 to 42
Calculation steps:
[( 42 - 397 ) ÷ 397] x 100 = -89.42%
Formula
Percentage change = [(42 - 397) / 397] x 100
Subtract the new number by the original number
42 - 397 = -355
-355 ÷ 397 = -0.8942065491183879
-0.8942065491183879 x 100 = -89.42%