-92.33% is the change from 391 to 30
Calculation steps:
[( 30 - 391 ) ÷ 391] x 100 = -92.33%
Formula
Percentage change = [(30 - 391) / 391] x 100
Subtract the new number by the original number
30 - 391 = -361
-361 ÷ 391 = -0.9232736572890026
-0.9232736572890026 x 100 = -92.33%