-83.72% is the change from 258 to 42
Calculation steps:
[( 42 - 258 ) ÷ 258] x 100 = -83.72%
Formula
Percentage change = [(42 - 258) / 258] x 100
Subtract the new number by the original number
42 - 258 = -216
-216 ÷ 258 = -0.8372093023255814
-0.8372093023255814 x 100 = -83.72%