86.55% is the change from 342 to 638
Calculation steps:
[( 638 - 342 ) ÷ 342] x 100 = 86.55%
Formula
Percentage change = [(638 - 342) / 342] x 100
Subtract the new number by the original number
638 - 342 = 296
296 ÷ 342 = 0.8654970760233918
0.8654970760233918 x 100 = 86.55%