34.58% is the change from 642 to 864
Calculation steps:
[( 864 - 642 ) ÷ 642] x 100 = 34.58%
Formula
Percentage change = [(864 - 642) / 642] x 100
Subtract the new number by the original number
864 - 642 = 222
222 ÷ 642 = 0.34579439252336447
0.34579439252336447 x 100 = 34.58%