-84.95% is the change from 279 to 42
Calculation steps:
[( 42 - 279 ) ÷ 279] x 100 = -84.95%
Formula
Percentage change = [(42 - 279) / 279] x 100
Subtract the new number by the original number
42 - 279 = -237
-237 ÷ 279 = -0.8494623655913979
-0.8494623655913979 x 100 = -84.95%