-86.36% is the change from 308 to 42
Calculation steps:
[( 42 - 308 ) ÷ 308] x 100 = -86.36%
Formula
Percentage change = [(42 - 308) / 308] x 100
Subtract the new number by the original number
42 - 308 = -266
-266 ÷ 308 = -0.8636363636363636
-0.8636363636363636 x 100 = -86.36%