-23.24% is the change from 340 to 261
Calculation steps:
[( 261 - 340 ) ÷ 340] x 100 = -23.24%
Formula
Percentage change = [(261 - 340) / 340] x 100
Subtract the new number by the original number
261 - 340 = -79
-79 ÷ 340 = -0.2323529411764706
-0.2323529411764706 x 100 = -23.24%