34.56% is the change from 680 to 915
Calculation steps:
[( 915 - 680 ) ÷ 680] x 100 = 34.56%
Formula
Percentage change = [(915 - 680) / 680] x 100
Subtract the new number by the original number
915 - 680 = 235
235 ÷ 680 = 0.34558823529411764
0.34558823529411764 x 100 = 34.56%