-26.18% is the change from 340 to 251
Calculation steps:
[( 251 - 340 ) ÷ 340] x 100 = -26.18%
Formula
Percentage change = [(251 - 340) / 340] x 100
Subtract the new number by the original number
251 - 340 = -89
-89 ÷ 340 = -0.26176470588235295
-0.26176470588235295 x 100 = -26.18%