18.23% is the change from 543 to 642
Calculation steps:
[( 642 - 543 ) ÷ 543] x 100 = 18.23%
Formula
Percentage change = [(642 - 543) / 543] x 100
Subtract the new number by the original number
642 - 543 = 99
99 ÷ 543 = 0.18232044198895028
0.18232044198895028 x 100 = 18.23%