-92.44% is the change from 397 to 30
Calculation steps:
[( 30 - 397 ) ÷ 397] x 100 = -92.44%
Formula
Percentage change = [(30 - 397) / 397] x 100
Subtract the new number by the original number
30 - 397 = -367
-367 ÷ 397 = -0.924433249370277
-0.924433249370277 x 100 = -92.44%