83.95% is the change from 349 to 642
Calculation steps:
[( 642 - 349 ) ÷ 349] x 100 = 83.95%
Formula
Percentage change = [(642 - 349) / 349] x 100
Subtract the new number by the original number
642 - 349 = 293
293 ÷ 349 = 0.839541547277937
0.839541547277937 x 100 = 83.95%