51.3% is the change from 540 to 817
Calculation steps:
[( 817 - 540 ) ÷ 540] x 100 = 51.3%
Formula
Percentage change = [(817 - 540) / 540] x 100
Subtract the new number by the original number
817 - 540 = 277
277 ÷ 540 = 0.512962962962963
0.512962962962963 x 100 = 51.3%