-11.76% is the change from 340 to 300
Calculation steps:
[( 300 - 340 ) ÷ 340] x 100 = -11.76%
Formula
Percentage change = [(300 - 340) / 340] x 100
Subtract the new number by the original number
300 - 340 = -40
-40 ÷ 340 = -0.11764705882352941
-0.11764705882352941 x 100 = -11.76%