28.4% is the change from 500 to 642
Calculation steps:
[( 642 - 500 ) ÷ 500] x 100 = 28.4%
Formula
Percentage change = [(642 - 500) / 500] x 100
Subtract the new number by the original number
642 - 500 = 142
142 ÷ 500 = 0.284
0.284 x 100 = 28.4%
Example