-86.4% is the change from 397 to 54
Calculation steps:
[( 54 - 397 ) ÷ 397] x 100 = -86.4%
Formula
Percentage change = [(54 - 397) / 397] x 100
Subtract the new number by the original number
54 - 397 = -343
-343 ÷ 397 = -0.8639798488664987
-0.8639798488664987 x 100 = -86.4%