51.29% is the change from 542 to 820
Calculation steps:
[( 820 - 542 ) ÷ 542] x 100 = 51.29%
Formula
Percentage change = [(820 - 542) / 542] x 100
Subtract the new number by the original number
820 - 542 = 278
278 ÷ 542 = 0.5129151291512916
0.5129151291512916 x 100 = 51.29%