87.39% is the change from 341 to 639
Calculation steps:
[( 639 - 341 ) ÷ 341] x 100 = 87.39%
Formula
Percentage change = [(639 - 341) / 341] x 100
Subtract the new number by the original number
639 - 341 = 298
298 ÷ 341 = 0.873900293255132
0.873900293255132 x 100 = 87.39%