-10.29% is the change from 340 to 305
Calculation steps:
[( 305 - 340 ) ÷ 340] x 100 = -10.29%
Formula
Percentage change = [(305 - 340) / 340] x 100
Subtract the new number by the original number
305 - 340 = -35
-35 ÷ 340 = -0.10294117647058823
-0.10294117647058823 x 100 = -10.29%