51.11% is the change from 542 to 819
Calculation steps:
[( 819 - 542 ) ÷ 542] x 100 = 51.11%
Formula
Percentage change = [(819 - 542) / 542] x 100
Subtract the new number by the original number
819 - 542 = 277
277 ÷ 542 = 0.511070110701107
0.511070110701107 x 100 = 51.11%