-42.11% is the change from 399 to 231
Calculation steps:
[( 231 - 399 ) ÷ 399] x 100 = -42.11%
Formula
Percentage change = [(231 - 399) / 399] x 100
Subtract the new number by the original number
231 - 399 = -168
-168 ÷ 399 = -0.42105263157894735
-0.42105263157894735 x 100 = -42.11%