53.7% is the change from 540 to 830
Calculation steps:
[( 830 - 540 ) ÷ 540] x 100 = 53.7%
Formula
Percentage change = [(830 - 540) / 540] x 100
Subtract the new number by the original number
830 - 540 = 290
290 ÷ 540 = 0.5370370370370371
0.5370370370370371 x 100 = 53.7%