50.37% is the change from 542 to 815
Calculation steps:
[( 815 - 542 ) ÷ 542] x 100 = 50.37%
Formula
Percentage change = [(815 - 542) / 542] x 100
Subtract the new number by the original number
815 - 542 = 273
273 ÷ 542 = 0.503690036900369
0.503690036900369 x 100 = 50.37%