87.1% is the change from 341 to 638
Calculation steps:
[( 638 - 341 ) ÷ 341] x 100 = 87.1%
Formula
Percentage change = [(638 - 341) / 341] x 100
Subtract the new number by the original number
638 - 341 = 297
297 ÷ 341 = 0.8709677419354839
0.8709677419354839 x 100 = 87.1%