-82.14% is the change from 168 to 30
Calculation steps:
[( 30 - 168 ) ÷ 168] x 100 = -82.14%
Formula
Percentage change = [(30 - 168) / 168] x 100
Subtract the new number by the original number
30 - 168 = -138
-138 ÷ 168 = -0.8214285714285714
-0.8214285714285714 x 100 = -82.14%