18.68% is the change from 455 to 540
Calculation steps:
[( 540 - 455 ) ÷ 455] x 100 = 18.68%
Formula
Percentage change = [(540 - 455) / 455] x 100
Subtract the new number by the original number
540 - 455 = 85
85 ÷ 455 = 0.18681318681318682
0.18681318681318682 x 100 = 18.68%