1255% is the change from 40 to 542
Calculation steps:
[( 542 - 40 ) ÷ 40] x 100 = 1255%
Formula
Percentage change = [(542 - 40) / 40] x 100
Subtract the new number by the original number
542 - 40 = 502
502 ÷ 40 = 12.55
12.55 x 100 = 1255%
Example