-93.91% is the change from 493 to 30
Calculation steps:
[( 30 - 493 ) ÷ 493] x 100 = -93.91%
Formula
Percentage change = [(30 - 493) / 493] x 100
Subtract the new number by the original number
30 - 493 = -463
-463 ÷ 493 = -0.9391480730223124
-0.9391480730223124 x 100 = -93.91%