-29.41% is the change from 340 to 240
Calculation steps:
[( 240 - 340 ) ÷ 340] x 100 = -29.41%
Formula
Percentage change = [(240 - 340) / 340] x 100
Subtract the new number by the original number
240 - 340 = -100
-100 ÷ 340 = -0.29411764705882354
-0.29411764705882354 x 100 = -29.41%