-98.17% is the change from 492 to 9
Calculation steps:
[( 9 - 492 ) ÷ 492] x 100 = -98.17%
Formula
Percentage change = [(9 - 492) / 492] x 100
Subtract the new number by the original number
9 - 492 = -483
-483 ÷ 492 = -0.9817073170731707
-0.9817073170731707 x 100 = -98.17%