51.67% is the change from 538 to 816
Calculation steps:
[( 816 - 538 ) ÷ 538] x 100 = 51.67%
Formula
Percentage change = [(816 - 538) / 538] x 100
Subtract the new number by the original number
816 - 538 = 278
278 ÷ 538 = 0.516728624535316
0.516728624535316 x 100 = 51.67%