-94.14% is the change from 512 to 30
Calculation steps:
[( 30 - 512 ) ÷ 512] x 100 = -94.14%
Formula
Percentage change = [(30 - 512) / 512] x 100
Subtract the new number by the original number
30 - 512 = -482
-482 ÷ 512 = -0.94140625
-0.94140625 x 100 = -94.14%