-87.31% is the change from 331 to 42
Calculation steps:
[( 42 - 331 ) ÷ 331] x 100 = -87.31%
Formula
Percentage change = [(42 - 331) / 331] x 100
Subtract the new number by the original number
42 - 331 = -289
-289 ÷ 331 = -0.8731117824773413
-0.8731117824773413 x 100 = -87.31%