85.47% is the change from 344 to 638
Calculation steps:
[( 638 - 344 ) ÷ 344] x 100 = 85.47%
Formula
Percentage change = [(638 - 344) / 344] x 100
Subtract the new number by the original number
638 - 344 = 294
294 ÷ 344 = 0.8546511627906976
0.8546511627906976 x 100 = 85.47%