-41.86% is the change from 172 to 100
Calculation steps:
[( 100 - 172 ) ÷ 172] x 100 = -41.86%
Formula
Percentage change = [(100 - 172) / 172] x 100
Subtract the new number by the original number
100 - 172 = -72
-72 ÷ 172 = -0.4186046511627907
-0.4186046511627907 x 100 = -41.86%