-94.21% is the change from 518 to 30
Calculation steps:
[( 30 - 518 ) ÷ 518] x 100 = -94.21%
Formula
Percentage change = [(30 - 518) / 518] x 100
Subtract the new number by the original number
30 - 518 = -488
-488 ÷ 518 = -0.9420849420849421
-0.9420849420849421 x 100 = -94.21%