-94.09% is the change from 508 to 30
Calculation steps:
[( 30 - 508 ) ÷ 508] x 100 = -94.09%
Formula
Percentage change = [(30 - 508) / 508] x 100
Subtract the new number by the original number
30 - 508 = -478
-478 ÷ 508 = -0.9409448818897638
-0.9409448818897638 x 100 = -94.09%