86.63% is the change from 344 to 642
Calculation steps:
[( 642 - 344 ) ÷ 344] x 100 = 86.63%
Formula
Percentage change = [(642 - 344) / 344] x 100
Subtract the new number by the original number
642 - 344 = 298
298 ÷ 344 = 0.8662790697674418
0.8662790697674418 x 100 = 86.63%