18.89% is the change from 540 to 642
Calculation steps:
[( 642 - 540 ) ÷ 540] x 100 = 18.89%
Formula
Percentage change = [(642 - 540) / 540] x 100
Subtract the new number by the original number
642 - 540 = 102
102 ÷ 540 = 0.18888888888888888
0.18888888888888888 x 100 = 18.89%