-25.88% is the change from 340 to 252
Calculation steps:
[( 252 - 340 ) ÷ 340] x 100 = -25.88%
Formula
Percentage change = [(252 - 340) / 340] x 100
Subtract the new number by the original number
252 - 340 = -88
-88 ÷ 340 = -0.25882352941176473
-0.25882352941176473 x 100 = -25.88%