-94.11% is the change from 509 to 30
Calculation steps:
[( 30 - 509 ) ÷ 509] x 100 = -94.11%
Formula
Percentage change = [(30 - 509) / 509] x 100
Subtract the new number by the original number
30 - 509 = -479
-479 ÷ 509 = -0.9410609037328095
-0.9410609037328095 x 100 = -94.11%