90.59% is the change from 340 to 648
Calculation steps:
[( 648 - 340 ) ÷ 340] x 100 = 90.59%
Formula
Percentage change = [(648 - 340) / 340] x 100
Subtract the new number by the original number
648 - 340 = 308
308 ÷ 340 = 0.9058823529411765
0.9058823529411765 x 100 = 90.59%