30.77% is the change from 260 to 340
Calculation steps:
[( 340 - 260 ) ÷ 260] x 100 = 30.77%
Formula
Percentage change = [(340 - 260) / 260] x 100
Subtract the new number by the original number
340 - 260 = 80
80 ÷ 260 = 0.3076923076923077
0.3076923076923077 x 100 = 30.77%