57.7% is the change from 539 to 850
Calculation steps:
[( 850 - 539 ) ÷ 539] x 100 = 57.7%
Formula
Percentage change = [(850 - 539) / 539] x 100
Subtract the new number by the original number
850 - 539 = 311
311 ÷ 539 = 0.5769944341372912
0.5769944341372912 x 100 = 57.7%