-93.88% is the change from 490 to 30
Calculation steps:
[( 30 - 490 ) ÷ 490] x 100 = -93.88%
Formula
Percentage change = [(30 - 490) / 490] x 100
Subtract the new number by the original number
30 - 490 = -460
-460 ÷ 490 = -0.9387755102040817
-0.9387755102040817 x 100 = -93.88%