-92.37% is the change from 393 to 30
Calculation steps:
[( 30 - 393 ) ÷ 393] x 100 = -92.37%
Formula
Percentage change = [(30 - 393) / 393] x 100
Subtract the new number by the original number
30 - 393 = -363
-363 ÷ 393 = -0.9236641221374046
-0.9236641221374046 x 100 = -92.37%