-7.35% is the change from 340 to 315
Calculation steps:
[( 315 - 340 ) ÷ 340] x 100 = -7.35%
Formula
Percentage change = [(315 - 340) / 340] x 100
Subtract the new number by the original number
315 - 340 = -25
-25 ÷ 340 = -0.07352941176470588
-0.07352941176470588 x 100 = -7.35%