-74.7% is the change from 166 to 42
Calculation steps:
[( 42 - 166 ) ÷ 166] x 100 = -74.7%
Formula
Percentage change = [(42 - 166) / 166] x 100
Subtract the new number by the original number
42 - 166 = -124
-124 ÷ 166 = -0.7469879518072289
-0.7469879518072289 x 100 = -74.7%