63.24% is the change from 340 to 555
Calculation steps:
[( 555 - 340 ) ÷ 340] x 100 = 63.24%
Formula
Percentage change = [(555 - 340) / 340] x 100
Subtract the new number by the original number
555 - 340 = 215
215 ÷ 340 = 0.6323529411764706
0.6323529411764706 x 100 = 63.24%