35.67% is the change from 642 to 871
Calculation steps:
[( 871 - 642 ) ÷ 642] x 100 = 35.67%
Formula
Percentage change = [(871 - 642) / 642] x 100
Subtract the new number by the original number
871 - 642 = 229
229 ÷ 642 = 0.35669781931464173
0.35669781931464173 x 100 = 35.67%