88.2% is the change from 339 to 638
Calculation steps:
[( 638 - 339 ) ÷ 339] x 100 = 88.2%
Formula
Percentage change = [(638 - 339) / 339] x 100
Subtract the new number by the original number
638 - 339 = 299
299 ÷ 339 = 0.8820058997050148
0.8820058997050148 x 100 = 88.2%