-82.56% is the change from 172 to 30
Calculation steps:
[( 30 - 172 ) ÷ 172] x 100 = -82.56%
Formula
Percentage change = [(30 - 172) / 172] x 100
Subtract the new number by the original number
30 - 172 = -142
-142 ÷ 172 = -0.8255813953488372
-0.8255813953488372 x 100 = -82.56%