64.12% is the change from 340 to 558
Calculation steps:
[( 558 - 340 ) ÷ 340] x 100 = 64.12%
Formula
Percentage change = [(558 - 340) / 340] x 100
Subtract the new number by the original number
558 - 340 = 218
218 ÷ 340 = 0.6411764705882353
0.6411764705882353 x 100 = 64.12%