-86.45% is the change from 310 to 42
Calculation steps:
[( 42 - 310 ) ÷ 310] x 100 = -86.45%
Formula
Percentage change = [(42 - 310) / 310] x 100
Subtract the new number by the original number
42 - 310 = -268
-268 ÷ 310 = -0.864516129032258
-0.864516129032258 x 100 = -86.45%