-29.71% is the change from 340 to 239
Calculation steps:
[( 239 - 340 ) ÷ 340] x 100 = -29.71%
Formula
Percentage change = [(239 - 340) / 340] x 100
Subtract the new number by the original number
239 - 340 = -101
-101 ÷ 340 = -0.29705882352941176
-0.29705882352941176 x 100 = -29.71%